Oh nice, I'm pleasantly surprised you gave it so much detailed thought
After hearing the possible regressions I think it's best to leave everything as-is for now. For production buildings I'll simply press R. It's more than workable, no worries.
Sorry for the Super Dune II confusion - my bad. I indeed use Classic v1.5g (fixes many ridiculous original mod bugs) with SUPER.EXE. It has been a while so I've forgotten.
Downloaded it from this site of all places:
http://www.abandonia.com/en/games/36/. Has nice readme inside with install instructions.
This isn't part of proposed leave as-is, I'd still VERY much love MouseHelper with SD2 - Classic
. But not at the expense of making you lose too much time on it.