To a certain percent it will change the normal flight characteristics of rudder inputs, yes. But think about this... depending on how much mix you need, say its 8% right aileron and 10% down elevator for example at full rudder deflection. Now you're coming in for a crosswind landing and you need a little rudder to correct, how often do you have to hold full rudder while shooting an approach? most of the time with all my planes it's less than 25% full rudder travel to keep 'er lined up on final, or takeoff for that matter. Mixing is usually proportional to the master channel meaning if you are using 25% right rudder on your approach that only feeds in 2% right aileron and 2.5% down elevator, the breeze will throw your plane around more than those small percentages of travel most likely. Doing a stall turn those small percentage of inputs coupled to the rudder probably wouldnt effect it much seeing when you kick the rudder in a stall turn the plane has almost no airspeed anyways and that small amount is even less noticeable at 5 mph than it is at 40 mph. Now if you need 25% aileron and 50% elevator to hold it straight on KE you will have much more adverse effects in all other flight aspects, so look at your %'s when you have your KE couple dialed in and consider it using that as your basis.

Just some thoughts and another perspective to look at it from, the only real way to tell is just to try it I am no aeronautical engineer myself, so take it as you will! Happy Flyin!