Is there a way to get the original trilogy and Blades of Avernum to play nice with larger screen resolutions?

...No. The resolutions were pretty much keyed in to the common display resolutions of the time. Maybe there's a way to hack it, but that's what happens when you play a game from 2000.

Widescreen users are probably the most annoying users on the internet in present day. Literally every forum they are there. You could go to a DOS game that hasn't had the source code touched since the 1980s, and they will be there asking if it supports widescreen monitors

oh, and why can't y'all run in window mode? isn't that the benefit? lots of horizontal real-estate?

or if its so much of a problem, why not keep a second normal monitor for such cases