More clear captured stones
The current small icons for "Black's captured stones" and "White's captured stones" are too small and they suffer the same old problem that are in many existing Go clients -- ambiguity. I can never tell how many Black or White captured stones on gGo, gIGo, and CGoban. I think the Android version of CGoban has greatly improved on this -- you want to make a wooden lid, with captured stones, just like what happens in real life -- a wooden lid with captured stones. This makes it very clear the number of captured stones for B and W. Thanks. :)
This takes too much space visually. A lot of functionality can go where the bowls with stones are, from board size to chat and other things.
Ed Lee commented
No, it does not take up too much space visually. Currently, the space on the left and right is completely wasted with a green background. The new PandaGo 2 browser client does this very beautifully -- they have a very beautiful board, beautiful stones, beautiful bowls and beautiful lids with captured stones. Too bad -- this is Kaya's loss.