Hey, thanks for the suggestions. That NotEye program is actually pretty interesting, although it's a bit of a pain to set up properly, and is a bit slow even on my relatively high end computer.
I tried changing the font in a regular console window, but it seems like DoomRL doesn't really like anything except the default font, because things end up looking wacky, especially the floor (circle) tiles.
I'm going to keep playing around with stuff, I'm not really sure what the best solution is yet.