Add RC Vehicles, as buyable or activate-able via an RC Van.
They can be used as travelling explosives or travelling mini weapons.
I'd suggest making this a cop exclusive (from cop shop, can only be controlled upto a certain distance and only 1 vehicle can be carried at once. ) since they'd probably use a lot of RC Vehicles to disable and annoy suspects till actual police arrives.
To balance this, maybe make their HP low so they're relatively easy to destroy so the cop can't just barge the RC car in the middle of a full group and has to think about making sure the RC car reaches the suspects alive.
This is a raw idea from me, any suggestions to improve this are welcome.