@Varun; the applied rule for a long time was that cops are allowed to shoot reds on foot, and orange vehicles to disable the vehicles. (with a long time, being since EGC started I believe.) I believe this was also in the old, unfinished rulesbook that WatakiWatako made about 8 months ago, I cannot find that topic anymore though.
I'd say, don't change the rule. Leave it allowed for cops to chase red criminals on foot, and oranges in vehicles. (ofcourse with the same warning which applies to the army warning)