Another suggestion.....and I've suggested this a number of times, and it would be VERY handy.
Use CTRL-Enter to post a message.
You're already using the P, B, R etc keys (which are handy I suppose, but it screws up 'search by typing'), but Ctl-Enter would save a button click. And fwiw that key combination is already being used to send an Email for example.....so it's in tune with other keys.
z