In fact, I have found that even with a non-maximized browser (Opera) at 1024x768, I find that tournament games are pushed down enought that I have to scroll the browser window to get the whole board on screen. At 1152x864, I'm fine, but my home machine won't do that resolution.
I understand that making different board sizes is a lot of work. You need at least 36 new graphic images for each board size (six different "sets" with six different piece images per set) and possibly more, depending on how the board and its border are created (I haven't checked).
Russ, if you like, I will volunteer to create those images at whatever sizes you would like.