I personally think this isn't worth a whole lot of time investment since
the Q to non-Q preference is something near 1000 to 1. Bughouse may be
different, but then those players have exotic customized interface needs.
But anyway, since it isn't my time... heh.
One idea off the top of my head is whenever a player can legally
promote, buttons could appear above the promotion square to indicate
which piece to become. In English, they would be labelled: Q R B N
Then instead of moving normally, the user could just click one of them
instead of even touching the promoting pawn.
