Make more than 1 character if you need to keep changing. Thats the way the game is supposed to be played.
If you need a reason why this entire thing is stupid, and will not be added, let me break it down for you.
1. HeRO added in cost increases to discourage reseting.
2. Reseting is implimented for mistakes, and leveling builds til 40-70.
3. Issues with missclicking the wrong build. OOPS.
4. This would encourage people to reset to try it. Uh. No.