Can't you just press C... you don't have to hold it.
Nope.I don't really see the point. Most games which have a walk control have it keybound to a button held for as long as you press it for, and so there's no real reason why it needs to be any different.
I don't know what kind of sticky keyboard you're using, but you in fact have to hold down C in order to walk.
my walk key is already on a toggle.
I'm jelly