Use Albo1125's Transport Van mod, it includes a van pickup for your prisoner and a ton more jail points, heck you can even teleport to a jail if you want. http://www.lcpdfr.com/files/file/8107-13rhook-022-more-jail-points-and-prisoner-transporter/
I agree with this, the other units NEED/MUST show you respect and realise you are actually in the pursuit, and like Killer007 said, try to calm them down instead of having them drive full speed into the rear end of a vehicle, because for one it causes the unit to crash rather than the suspect and two, its not very geniune tactics, its not even a correct pit maneuver.
There are mods that already provide most of the features you listed. I doubt LSPDFR will want to implement them.