For dev.
You don't need to play game or even have direct feedback from users.
1. Make statistics. (actually it is a kind of indirect user feedback).
2. Sort skill by categories/utilities/profession, etc.
3. Change or Nerf top 10 most used skills from each skill set.
4. Change or Buff top 10 least used skills from each skill set.
5. Randomly Change, Buff or Nerf 10 average skills to insure dynamism in this skill balancing system.
For long term add a routine that regularly (monthly) slightly adjut these top skill in recharge/casting time/costs. Without human interraction.
Depending on how skill sets are made for SD, statistics on those skills could even be used for it.
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