Thank you Michael, that's it! Is there a guide for scripting / macroing MoI? I'd like to modify it even further to automatically pick remove mode so I wouldn't have to do additional click.
Also when it comes to guides - is there a one that would show how do you add custom buttons? I've done mods for my Rhino and Modo installs and would like to see what can be done with MoI :) .

@Pilou: the result is identical in both cases , both manual and with trimstencil. The difference is in workflow - less clicks and that's what I'm looking for :) .

I'm liking what I see so far. Next time I'd probably try doing a sample project first in Rhino / Modo then in MoI so I could make more educated comparisons.