Well, no, it wouldn't take any extra precision. If anything, the current setup takes more precision as you have to keep all servos in sync or it'll be pushing one servo against the others. Right now you could unbolt one of the 4 servos that are on it and it would still work just fine. You wouldn't need to reprogram anything, just having 3 working servos and one completely disconnected would still keep it in the exact same position.