Maybe Shift Tab? It seems free, at least in Ubuntu.

Well, I didn't thought it was already in use here, to move the code blocks: TAB forward, Shift TAB backward. It's time for a vacation...

Nonsense..... Ubuntu takes all key associated actions (bindings/flipping etc) from its /usr/.imp folder. You can manually edit it. Just be root

commented: I really don't like this tone Wojciech - this detracts from any fair point that you may be making +0
commented: Please stop saying "nonsense". It's rude. +0

@Wojciech_1 with here I mean here in Daniweb ;D