(seriously, though, there was even a bit of discussion in the freedesktop mailing lists about the possibility to have multiple X installed, but I guess that FHS compliance kills this possibility, or at least an easy implementation of it.)
You're free to install multiple X versions, just do it outside of portage. There's no more reason to slot X than to slot anything else in the world, but we don't make every other package slottable.
Something like this: cat >> xc/config/cf/host.def << EOF #define ProjectRoot /usr/local/Xone #define NothingOutsideProjectRoot YES EOF make World make install
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