It would be nice to have a custom class creation mechanic. Essentially, one chooses a baseline class out of the present 5, class name, maybe even stat affinities and then customizes perk progression (possibly with perks of classes PC has already trained for if the game registers it). Or just grant player ready presets through non-standard trainers, scattered through the world, similar to non-class power trainers (Honestly, been jealous of Cait's hexblade leathers since it was introduced).
Also some spellblades and other mage-alligned equipment would be good, but, from what I've learnt in the game, they probably would be found and sold in Tychris, right? Though, there was also that gnoll lady from Cait's personal quest and her possible know-how.