The only reason why we don't have this support in Blitz3D's commandset is probably that this feature isn't compatible with all graphics hardware. But I would like to see who can`t perform a render to texture
that most likely should be quite an inexistant issue.
Even Intel Onboards and cards back till TNT1 or 2 are capable of R2T ... so its at best an excuse for 2D cards that do not have TnL but on those card it does not make a difference anyway ... they will run totally crappy in graphics 3d mode.