Unmapping Spacebar?

[cuisinart8]

I have "fire guns" set to my joystick trigger, but for some reason SF2 seems to also have the spacebar bound to fire your cannons. I have a bad habit of fat-fingering keys in-flight, which sometimes leads to hitting spacebar instead of alt when trying to come out of time compression and thus firing off all of my cannon rounds! Is there a way to unbind spacebar from the "fire guns" command? It's not in the in-game key bind list. I did see a "ControlSet002" section of the controls .ini but erasing the spacebar binding for "FIRE_PRIMARY_GUN" didn't have any effect.

[Spinners]

You could try allocating the space bar to a task rarely required, e.g. fire secondary guns.