The docking system currently in place is very difficult to use. Increase the docking magnet strength and fix the issue where crafts start to spin when they are close to each other. Allow auto SAS to be active on multiple crafts simultaneously. It's almost impossible to dock right now.
Docking is really easy in this game. I do think it would be nice to have a system that stops the spinning while docking but the magnets are plenty strong. I would prefer no magnets at all. Orbiter 2006 is what I usually compare to as that is where I first learned spaceflight.