Hi,
does anyone know if there is a way to add more than the limited amount of trackers in Tixati Trackers Settings?

Without more information I don't know exactly what you're referring to. But you realistically don't need more than one tracker + dht. Only if you're trying to download a dead torrent does it make sense to add more than 2. If you're downloading a dead torrent you can add more by selecting the torrent, clicking on the "Trackers" tab, right click on a blank space > edit trackers, then add trackers adding a blank line between listings. AFAIK there is no limit.