yes, open gameplayercontrols.lua and find and remove the parts you don't want to be active in the game (keep a back up and don't allow GG to update or verify as it will overwrite any changes)
for instance
lines 804 - 870
-- Handle player jumping
lines 1168 - 1214
-- control animation of third person character (notably being able to aim)
line 685
SetGamePlayerControlBasespeed(2.0)
probably change to
SetGamePlayerControlBasespeed(1.0)
to remove sprinting
it's not a quick process i'm afraid
