Ok, I might be able to modify the skill panels to allow for more skills:
- In the normal skill panel, we have some space left anwyway.
- In the compact skill panel, I could remove the minimap, if a level uses more than 8 skills.
But there is no hope to get all 17 (soon 19) different skills on the skill panel. Therefore there has to be some limit.
And, yes, probably it is a good idea to add a warning message in the editor already.