I see.
But isn't that confusing?
Why don't u make an option called "16:9 correction"?
This would be clearer than "fullscreen" (which will activate the 4:3 correction o.O).
The suggestion:
Why don't you insert a complete screen correction in scummvm?
Like other projects (wiimc, mplayer, GX Emulators etc)
I mean, to choose the screen shift and the screen zooming.
You can also look at the code of these projects to get the experience how to realize that.
Example:
http://www.google.com/codesearch/p?hl=d ... cd=7&ct=rc
http://www.google.com/codesearch/p?hl=d ... cd=8&ct=rc
I dunno the code of scummvm (I believe it's in c++), but this screen-correction isn't hard to implement.
So you would get rid of the whole Hardware/TV specific properties and the user can set his own solution (depend on the TV, Screen, Beamer etc).
For example: At the moment, I have 3 black bars (upper, left and right side) and the screen is moved downside. If you insert an overscan, I can correct the down-moved-screen. But the bars left, right and upside cannot be corrected (and will become bigger).
A friend of mine, got the problem that his screen is too far on the right side.
Imo it's very important to create a solution for the screen adjustment (so that everyone can optimize the screen/frame of scummvm concerning TV or other Screen-Hardware), especially if you are going to run scummvm on many platforms.
This is just a proposal.

No critic or anything like that. ^^
I like your project very much.