So I've done a lot of thinking and experimenting with feats (features). It's a complex thing, and to list all feats that exist in game seems like it would need a community effort. It's too much for one person.

So thinking about this I've added an export/import system in the editor. Much like the appearance code you are able to export a code from one character that you can then import on another character.
E. g. You can create a custom character via the pathfinders and then save, load the save file in the editor and export all feats you want and import them onto another character.

Testing this seems to work very well. I've even been able to add trickster feats to my newly created character without mythic path, and everything seems to work.

This is released with version 1.12.0 please go ahead and try it out.

Sharing codes
I've created a basic wiki to atleast have some sort of code sharing. If something better comes up, then I'll look into switching to a better solution.
https://arcemi.fandom.com/wiki/Feat_Codes