Like some other posts here, I'd say you should check up on some games sometime. The last 20 or so I had a lookie at all but one had a proper widescreen support. The only one to not really support widescreen was Quake II, I think it was. Supports the widescreen format of 640x480, which is around 450x350 ish?
Not sure what you trying to say by "I'd say you should check up on some games sometime" but if you follow the link I gave (http://www.widescreengamingforum.com/wiki/index.php/Essential_Games_List) it gives fixes for almost all games that have problems with widescreens. I think it makes the game have two black stripes down the left and right side of the screen so the games look normal (if the game doesn't do this automatically), but most people say the black lines are not a distraction at all.
In summary, he can play all his games properly AND he can have the advantage of lots of screen area for his graphics design stuff such as photoshop. Thats a win-win situation in my books.