Good point. Guess I didn't notice this since I am using widescreen sprites by default. Hexen is a special case since it uses some weapons that actually touch the side of the screen. In Doom and Heretic they stay centered.
In general I think that's something that may be solved from renderer side. It doesn't restrict functionality of the status bar itself, though.
In the worst case I could include the problematic weapon frames from the widescreen mod (with proper credit), but as soon as a mod replaces the weapons, it'd break again. Hexen isn't that popular for modders, though, so it may not be an issue. Since this is supposed to be a status bar mod however, I'd prefer to keep other kinds of graphics out of it. Most people out there will use it for Doom, anyway.