I make quite a few gear systems for my projects but realised that this seems to be rather complicated for most users.
Don’t mind abusing the parametric model maker for other SCAD scripts but I think a Gearbox generator would be a great addition and it won’t require AI 
Define the required ratio and overall size/shape, let the generator worry about the gears, their placement and such.
I do those things the manual way and am hopeless with SCAD…
Doesn’t have to be too fancy, stacked, flat gears will do fine for most applications.
Maybe a planetary addition in the advanced tap together with matching gears for clock mechanisms ?