heh , how about a servo that both leans the hsn and shoots the nitrous... no engine damage there, after abit of trial and error maybe...
also, i think the amount of lube that enters the engine doesnt decrease when your shooting the nitrous, its just that fuel like never gets 100% combusted in any engine, which is where nitrous comes in, but then again im no good with nitro engines...acheiving a higher % of fuel burnt in the cylinder somehow makes the engine get less lubricated?

::edit:: i think its kind of cute tho, tuning your needles via servos on the go..... even if its not race legal maybe people can just make a mount for the servo on the chassis so they dont have to keep on driving back to wrench on their cars,just keep adding clicks on the radio until the engine sounds just about right... but a 4 channel radio might be abit expensive tho....