R key for record
Cmd + T to split region at playhead position (I don't think cmd + T is default for this function - I believe I set it through Key Commands at optn + K)
Shift + optn + click and drag region to different track to copy and paste
Option + click on blue plugin icons to bypass/engage
Not really a "keyboard" shortcut, but I double click on the playhead for play
That's all I have for now. I'll probably think of more later.
Man, I wish there were more Logic people on this board.