Re: New guy, new concept...
Since gesture basiclly means the character has to make some kind of visible and noticable movement with hands or arms to activate the power the touching of the runes with a finger in a complex pattern has to be noticeable to anyone nearby, like casting a magic spell.
You couldn't put your hands behind your back and touch the runes,(by memorizing the feel of each rune) or by pressing it against something while bound.
So you might want to rethink gestures.
At least this is the way i remember gestures, i don't have my book with me, so if i'm wrong sombody just chime in.