Not necessarily my biggest gripe with games, but one of my biggest pet peeves lately is games that don't let you choose between toggling or holding crouch/sprint. I hate being forced to let go of W to stop sprinting, at least let me press shift again to stop. I don't remember what game it was, but there was one I was playing a while back that would toggle sprint if you tapped shift, but if you held it, it would stop when you let go. I don't remember having seen that since then, but it worked well.