diff --git a/core/systems/ForwardSys.cpp b/core/systems/ForwardSys.cpp
index 2103b1d6..404e2fef 100644
--- a/core/systems/ForwardSys.cpp
+++ b/core/systems/ForwardSys.cpp
@@ -297,7 +297,7 @@ int CForward::Execute(cell_t *result, IForwardFilter *filter)
 				{
 					func->PushStringEx((char *)param->byref.orig_addr, param->byref.cells, param->byref.sz_flags, param->byref.flags);
 				} else if (type == Param_Float || type == Param_Cell) {
-					func->PushCellByRef(&param->val, 0); 
+					func->PushCellByRef(&param->val); 
 				} else {
 					func->PushArray(param->byref.orig_addr, param->byref.cells, NULL, param->byref.flags);
 					assert(type == Param_Array || type == Param_FloatByRef || type == Param_CellByRef);
@@ -434,7 +434,7 @@ int CForward::PushFloat(float number)
 	return SP_ERROR_NONE;
 }
 
-int CForward::PushCellByRef(cell_t *cell, int flags)
+int CForward::PushCellByRef(cell_t *cell)
 {
 	if (m_curparam < m_numparams)
 	{
@@ -452,13 +452,13 @@ int CForward::PushCellByRef(cell_t *cell, int flags)
 		m_params[m_curparam].pushedas = Param_CellByRef;
 	}
 
-	_Int_PushArray(cell, 1, flags);
+	_Int_PushArray(cell, 1, SM_PARAM_COPYBACK);
 	m_curparam++;
 
 	return SP_ERROR_NONE;
 }
 
-int CForward::PushFloatByRef(float *num, int flags)
+int CForward::PushFloatByRef(float *num)
 {
 	if (m_curparam < m_numparams)
 	{
@@ -476,7 +476,7 @@ int CForward::PushFloatByRef(float *num, int flags)
 		m_params[m_curparam].pushedas = Param_FloatByRef;
 	}
 
-	_Int_PushArray((cell_t *)num, 1, flags);
+	_Int_PushArray((cell_t *)num, 1, SM_PARAM_COPYBACK);
 	m_curparam++;
 
 	return SP_ERROR_NONE;
diff --git a/core/systems/ForwardSys.h b/core/systems/ForwardSys.h
index e0ce371b..287b5eff 100644
--- a/core/systems/ForwardSys.h
+++ b/core/systems/ForwardSys.h
@@ -47,9 +47,9 @@ class CForward : public IChangeableForward
 {
 public: //ICallable
 	virtual int PushCell(cell_t cell);
-	virtual int PushCellByRef(cell_t *cell, int flags);
+	virtual int PushCellByRef(cell_t *cell);
 	virtual int PushFloat(float number);
-	virtual int PushFloatByRef(float *number, int flags);
+	virtual int PushFloatByRef(float *number);
 	virtual int PushArray(cell_t *inarray, unsigned int cells, cell_t **phys_addr, int flags);
 	virtual int PushString(const char *string);
 	virtual int PushStringEx(char *buffer, size_t length, int sz_flags, int cp_flags);
diff --git a/core/vm/sp_vm_basecontext.cpp b/core/vm/sp_vm_basecontext.cpp
index d6c4393e..eb6a52b7 100644
--- a/core/vm/sp_vm_basecontext.cpp
+++ b/core/vm/sp_vm_basecontext.cpp
@@ -212,11 +212,11 @@ void BaseContext::SetErrorMessage(const char *msg, va_list ap)
 	vsnprintf(m_MsgCache, sizeof(m_MsgCache), msg, ap);
 }
 
-void BaseContext::ThrowNativeErrorEx(int error, const char *msg, ...)
+cell_t BaseContext::ThrowNativeErrorEx(int error, const char *msg, ...)
 {
 	if (!m_InExec)
 	{
-		return;
+		return 0;
 	}
 
 	ctx->n_err = error;
@@ -228,6 +228,8 @@ void BaseContext::ThrowNativeErrorEx(int error, const char *msg, ...)
 		SetErrorMessage(msg, ap);
 		va_end(ap);
 	}
+
+	return 0;
 }
 
 cell_t BaseContext::ThrowNativeError(const char *msg, ...)
diff --git a/core/vm/sp_vm_basecontext.h b/core/vm/sp_vm_basecontext.h
index 68651e3f..43d6d511 100644
--- a/core/vm/sp_vm_basecontext.h
+++ b/core/vm/sp_vm_basecontext.h
@@ -61,7 +61,7 @@ namespace SourcePawn
 		virtual int BindNative(const sp_nativeinfo_t *native);
 		virtual int BindNativeToAny(SPVM_NATIVE_FUNC native);
 		virtual int Execute(uint32_t code_addr, cell_t *result);
-		virtual void ThrowNativeErrorEx(int error, const char *msg, ...);
+		virtual cell_t ThrowNativeErrorEx(int error, const char *msg, ...);
 		virtual cell_t ThrowNativeError(const char *msg, ...);
 		virtual IPluginFunction *GetFunctionByName(const char *public_name);
 		virtual IPluginFunction *GetFunctionById(funcid_t func_id);
diff --git a/core/vm/sp_vm_function.cpp b/core/vm/sp_vm_function.cpp
index c7f3b5a6..49f6a483 100644
--- a/core/vm/sp_vm_function.cpp
+++ b/core/vm/sp_vm_function.cpp
@@ -79,14 +79,14 @@ int CFunction::PushCell(cell_t cell)
 	return SP_ERROR_NONE;
 }
 
-int CFunction::PushCellByRef(cell_t *cell, int flags)
+int CFunction::PushCellByRef(cell_t *cell)
 {
 	if (m_curparam >= SP_MAX_EXEC_PARAMS)
 	{
 		return SetError(SP_ERROR_PARAMS_MAX);
 	}
 
-	return PushArray(cell, 1, NULL, flags);
+	return PushArray(cell, 1, NULL, SM_PARAM_COPYBACK);
 }
 
 int CFunction::PushFloat(float number)
@@ -96,9 +96,9 @@ int CFunction::PushFloat(float number)
 	return PushCell(val);
 }
 
-int CFunction::PushFloatByRef(float *number, int flags)
+int CFunction::PushFloatByRef(float *number)
 {
-	return PushCellByRef((cell_t *)number, flags);
+	return PushCellByRef((cell_t *)number);
 }
 
 int CFunction::PushArray(cell_t *inarray, unsigned int cells, cell_t **phys_addr, int copyback)
diff --git a/core/vm/sp_vm_function.h b/core/vm/sp_vm_function.h
index 4b13f66d..da8713be 100644
--- a/core/vm/sp_vm_function.h
+++ b/core/vm/sp_vm_function.h
@@ -35,9 +35,9 @@ public:
 	CFunction(uint32_t code_addr, IPluginContext *pContext);
 public:
 	virtual int PushCell(cell_t cell);
-	virtual int PushCellByRef(cell_t *cell, int flags);
+	virtual int PushCellByRef(cell_t *cell);
 	virtual int PushFloat(float number);
-	virtual int PushFloatByRef(float *number, int flags);
+	virtual int PushFloatByRef(float *number);
 	virtual int PushArray(cell_t *inarray, unsigned int cells, cell_t **phys_addr, int copyback);
 	virtual int PushString(const char *string);
 	virtual int PushStringEx(char *buffer, size_t length, int sz_flags, int cp_flags);
diff --git a/public/sourcepawn/sp_vm_api.h b/public/sourcepawn/sp_vm_api.h
index cfdb5958..67111d94 100644
--- a/public/sourcepawn/sp_vm_api.h
+++ b/public/sourcepawn/sp_vm_api.h
@@ -70,7 +70,7 @@ namespace SourcePawn
 		 * @param flags		Copy-back flags.
 		 * @return			Error code, if any.
 		 */
-		virtual int PushCellByRef(cell_t *cell, int flags) =0;
+		virtual int PushCellByRef(cell_t *cell) =0;
 
 		/**
 		 * @brief Pushes a float onto the current call.
@@ -91,7 +91,7 @@ namespace SourcePawn
 		 & @param flags		Copy-back flags.
 		 * @return			Error code, if any.
 		 */
-		virtual int PushFloatByRef(float *number, int flags) =0;
+		virtual int PushFloatByRef(float *number) =0;
 
 		/**
 		 * @brief Pushes an array of cells onto the current call.  
@@ -505,8 +505,9 @@ namespace SourcePawn
 		 * @param error		The error number to set.
 		 * @param msg		Custom error message format.  NULL to use default.
 		 * @param ...		Message format arguments, if any.
+		 * @return			0 for convenience.
 		 */
-		virtual void ThrowNativeErrorEx(int error, const char *msg, ...) =0;
+		virtual cell_t ThrowNativeErrorEx(int error, const char *msg, ...) =0;
 
 		/**
 		 * @brief Throws a generic native error and halts any current execution.