Tbh I don't find the 8 ability slots to be a UI limitation, but a balancing limitation. I would have no problem with this limitation being carried over to DA4 provided the game was balanced appropriately. Rarely in DAI did I feel annoyed at not having more ability slots. With the removal of sustainables and the addition of more meaningful passives, ability restriction added another layer of strategy. Could the game be balanced a bit better? Sure, could the abilities and skill trees have been designed better? Absolutely. But my criticisms of DAI's combat is an essay for another thread
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As for the PC controls... oh man. I couldn't believe that Bioware had the balls to heap praises on the PC version in that "Why DAI is awesome on PC" video they released a while back. While it is not a terrible port as some would exaggerate, I can't say it's anything better than playable. I expected a lot more from BW and now I've learned to be wary about their future PC releases.
Control fixes that I think are necessary for DA4:
- auto-attack (that isn't married to tac-cam) at launch
- walk-toggle at launch
- tac-cam that doesn't respect terrain
- tac-cam that has variable zoom like DAO (Not like DAI where you set the zoom distance in the game menu)
- click to move
- click to interact (looting, levers, doors)
- drag select
- menus that are designed for a mouse not analog sticks