With regards to high score leaderboards, several levels have places where unlimited points can be farmed pretty easily. The boss fights on levels 1 and 2 are the clearest examples, but you can also get points by swinging at the level 3 boss when it's not vulnerable and by hitting Darth Maul while he tries to run away on level 10.

I'd be really interested in a "100 skill" category. Finish each level with the necessary score for obtaining 10 skill points / all 3 bonuses (24,000 for level 1, 21,000 for level 2, etc.). Several levels have sections where you can double-dip on points by doubling back after getting a checkpoint and dying, so I think mapping out an optimal route would be a lot of fun. Plus, with how much extra combat there would be, the character selection meta would be a lot more open than it is for any%. I would estimate the run at somewhere in the 3-4 hour range with good routing and execution. I don't currently have time to do runs of that length, but I could work on mapping out a route and maybe piecing together a segmented demonstration run if there's interest in adding the category.

I’m way late to this, but my understanding is that level 14 can only be unlocked in single player mode. My brother and I did a co-op playthrough on Jedi mode as Plo Koon and Mace Windu. We unlocked Plo Koon’s bonus level (Droidekas), but not Mace Windu’s (Level 14 - Survival Challenge).