The Visual Studio IDE and MS VC compilers are actually different applications, e.g. like Linux Code::Blocks and GCC. There's no correlation between the IDE's bitness and the bitness of compiler suite it controls. Just install it and forget; you will be able to create both 32- and 64-bit applications seamlessly.
I think MS actually is monitoring the developers' demand in this regard. Since WoW64 integration with the 64-bit Windows operating systems is perfect, maybe there's simply not enough interest to stimulate the extra effort (yet).