Mod Support: Extra Skill and Perks entries

I'm modding the skilltree at the moment.
I encountered a roadblock in my development as I cannot add extra Skills to the skill tree.
E.g Extending Cooking with Grilling III

To a lesser degree I have the same issue with Skillperks.
I found 4 unused ones, but still I would at minimum need a Skill Perk per Skill (when expanded if you would expand the skill part). As I found a way to recombine skillperks into one Perk, if you are willing to mess with names and descriptions.

A few extra skillgroups would also feel handy, and especially a better way to reorganize them (maybe and extra order field or something), cause currently I'm doing this via transpiling, which is way to hacky to be robust to future updates.

Thank you for your consideration.