The practice server does run MR, mostly so guys can get a rating while running some laps on it. It doesnt filter out ratings in any way but I did notice that running stracker on the servers has raised warping amounts. In terms or MR the only netcode issues Ive seen with it is that when MR uses auth to filter people joining there is at times a server wide lag as a new user is announced.
Stracker has been causing more warps all round but I also experimented last nite running only stracker on the practice server, and mr only on the other servers and still noticed a bit more warping on either server.
I see the what Minolin is looking for is to try and find a way to detect warp caused collisions not necessarioy plugins causing extra warps. I did run mr for quite a while before I went away and overall other then the odd join lag it was pretty solid. Running stracker again has seemed to degrade the net quality though so when I get a chance I will experiment a bit more but I really want to run mr for the pub servers and stracker is great for the practice server. It just seems on my amazon instance this is not a great combination unfortunatly.