The SWAT-4-style spin-and-cuff feature would be a welcome addition. I had the bomber on nightclub surrender while facing me at the end of a hallway - it was a very tense walk to get behind him.
Maybe they could even look at a spin-and-cuff for stunned/staggering suspects (a la SWAT 4 PVP) as a stand-in for a tackling mechanic?