One thing that I always want and never get from VAX are the function definitions of the functions defined in the windows.h headers.
Most functions there are defined like
#ifdef UNICODE
#define ExpandEnvironmentStrings ExpandEnvironmentStringsW
#else
#define ExpandEnvironmentStrings ExpandEnvironmentStringsA
#endif // !UNICODE
So, clicking on a function shows only the define but not the underlying function definition. VAX could load this even from a predefined list (like the helper .h vax already uses for std lib and others).
Would be extremly helpful.