Please allow playback toggle to be re-programmed to a key other than Space

I would appreciate the ability to re-program the playback shortcut from Space to another key - for me, it would be the down arrow key. This would allow me to very quickly edit my audio without having to move my hands on the keyboard at all as I have reassigned Mix Paste to Shift + Up Arrow, and as a I mouse left handed, toggling is the only thing I really need to lift my hand for.