In dealing with some existing conditions, actually, yes... and it's not so much that the sill is proud of the casing but that the sill is proud of the wall. Dealing with a couple of situations where the existing building has been re-sided and the new siding extends past the window (not ideal, I know, but it's what's there).
Changing that wall closure to custom helped get me close enough, it's not past but it's not sticking out as far.
Thanks for your help!
Bill Szustak RA
Principal, Springboard Design
ArchiCAD 25, macOS Ventura 13.4.1