Personally, I'm not sure if it's posible in BL as I havent experimented with many datablock speed values, but would it be possible for running speed to slowly increase as you run (and maybe even lose a bit of momentum on landing after making a jump).
I know this could never be as amazing as Mirror's Edge, but the video you have sure makes it look nice.
GJ
It already quite does, honestly. The fact that it takes too long to accelerate will bother lots of users. :V
Wait up for RTB preferences, though! They will let you modify EVERYTHING in game.
EDIT: Whoops, double toast.
2EDIT: Guys, does the playertype work for everyone else in Slayer/Default minigame/Outside a minigame? I'm having some trouble with it..
3EDIT: Okay, there's some huge bug that breaks entire parkour system and I don't know how to recreate it. Fuuuuuck.