One of the developers said a while ago that "pro players" would be able to not use the SMART button at all and just combine sprint, jump and duck to do everything the smart button does. Well, this doesn't exist. There is no separate sprint button, and 90% of all the failures I do with the SMART is because it does something different than what I'm trying to do. Most often it mantles over a small ledge that is near me even tho I am not pointing at it.

Give players an option to not use the SMART button at all and combine sprint, jump and duck to do all that the SMART button does.

I've been doing manual parkour for the past few days... Just tap the smart button for sprint.

What Trust said, just tap and your simply run, controlling the jumps and ducks like Mirrors Edge.