.. of course bug fixes should have higher priority than the rest. Very annoying bug when removing pieces from board setup. Just try to setup a board with slower connection, often one needs to reload missing pictures also, then this problem with removing more pieces than the one selected, makes the process very long and annoying. It's so hard to find the cause of this bug? There are more games influenced by this, all that need initial setup I believe. Then some other missing things in games with setup prior to actual game:
1) it would be useful to save together positions for different variants on same boards (like espionage variants, crazy/screen chess, battleboats variants)
2) it should be possible to rewind to initial position, not only to move 1

Sometimes when you move backward, you cannot make a move after going back forward without reentering the game. I experienced even a problem placing first piece, random placement and clear board helped I think.
Chess games: reversed notation when setting up black's position, always from white's sight.

Sure some of these are in bug reports, I just grouped more things about this group of games.