I think it is reasonable to get a macro definition change into 2.6.
The OP's request is essential for his application (running Python
on Nokia phones) and it would be a loss to wait two years for this.
Also, his request for a macro will enable another important piece
of functionality -- allowing a build to intercept and instrument all
calls to the memory allocator.

Barry, can you rule on whether to keep this open for consideration in 
2.6.   It seems daft to postpone this discussion indefinitely.  If we 
can agree to a simple, non-invasive solution while there is still yet 
another beta, then it makes sense to proceed.