QRF needs to get to hostiles fast because, you know, "Quick" response force. If you can't have just straight-up increased movement speed since it can be abused, then this was the next best option. RC currently has the same movement speed as all normal regiments, while the two other roaming regiments of Jedi and Shadow have increased movement speed. This means in many events, RC is just left running from place to place to perform QRF, but once they get to said enemies, half or even all hostiles have already been clcleared