Selecting Servos
When I upgrade, I always find the "select servo" dialog an interruption.
Perhaps servos could be selected at first drop instead of before upgrading. This would put the selection at the time you are thinking about dropping a servo. If it was extended to the first servo, you could completely eliminate the "first servo" flag and all the fiddlyness that comes when a part is removed and the flag gets moved to a legal servo.
p.s. maybe I've missed it, but I'd like a way to see my own servo stats in-game (similar to the way I can see the other team's servos), other than the select servo dialog.