Don't know if it would be accepted, but it would actually pretty nice if we could add in LFS editor different engines to different configs.

The mod system has its own separate section in the forum: https://www.lfs.net/forum/498-Vehicle-Mods-Forum

There is a thread for suggestions for the mod editor itself: https://www.lfs.net/forum/thread/100169

This suggestion (multiple engines in 1 mod) has already been written in that thread: https://www.lfs.net/forum/post/2053421#post2053421