A private tracker I just joined apparently has rules about keeping PEX and DHT off. I don't want to turn them off universally for tixati, just for that tracker's torrents. Is there a way to make only certain categories not use PEX and DHT. This would be very useful since I could easily make it so only there private tracker's torrents go into a specific category.

not for categories, but you can turn off DHT and/or PEX for a specific torrent.

the categories suggestion is a good one.

Does that tracker not mark the torrents as private?

If they do then PEX/DHT should already be disabled for them. If not, I would wonder why they don't as it sounds like this is a "private" tracker.

I'm certain they do. I wonder why the specified turning those two things off then. I didn't know they would be turned off automatically though, there's still alot about torrents I don't get/understand.

that rule certainly apply when you creating a torrent file