Hi dan, I'm glad that you're liking MoI! :)

re:
> There are a lot smaller lines (hidden detail dashed lines and other spurious lines) that I could do
> without. Is this something that could easily be implemented with an MOI script?

Check out this script - it will select objects smaller than a particular bounding box size (measured by the diagonal of the bounding box):

http://kyticka.webzdarma.cz/3d/moi/#SelectTiny

- Michael