Yeah, I like this idea. The feats we have are so poorly balanced, and the number of feats you can pick up so slim, that you're handicapping your characters by not giving them the same handful of meta options again and again. Separating them into a new category would be a fun way of handling this and adding some flavor customisation without nerfing the likes of Alert, Great Weapon Master/Sharpshooter, Savage Attacker, Tavern Brawler, War Caster, Ability Improvement, etc. (I also like the idea of picking up unique disadvantages a la Shadowheart's fear of wolves, if balance is an issue!)
I think that could be doable, like blind fighting for example. You could be more likely to hit while blinded but take a negative in attack rolls to a reasonable amount.
Let me just put it this way, we need more feats in general, especially ones that could be useful to specific classes, as I said earlier subvocal casting would be great but would also need "silence" a rework as a turn condition opposed to an avoidable bubble, a spell I never have on my list because it just about useless and we need dispel which is in all D&D games. Don't any of you give me that 5e excuse please. It's simply incomplete.
