Please educate yourself on the basic limitations and how SA-MP works in general before suggesting stuff. Server developers have no direct access to modifying hitreg. That's what SA-MP developers do. There are some ways you can mess with it to try and improve it, such as modifying the server tick-rate (which we have already done) or making an entirely gamemode-based health/hitreg system which doesn't work for a Freeroam/DM type server (such systems are only used on roleplay servers, for custom damages and what-not).
Also if you want your suggestion to be taken at least remotely seriously, put some effort into it.