beyond the purpose of what we use SH3D

I agree with that and I prefer to remain so.
SH3D is relatively unique as free CAD and simple to use at least for linux.

It's not a 3D game!

I agree also BUT...
Why You don't make a plugin for SH3D or a separate application able to use sh3d file to play games.
You only need a game engine to incorporate (with source code of course).
Could be a challenge.