Which choices from previous games, should have consequences in the next game?

I didn't say I didn't consider killing him evil. He is a defenseless old man. It's just that this is an evil founded in legitimate fear of the real harm his work could do, and that might have had actually helped her people more than it harmed the world at large. (Although we'll never actually know since subsequent games retconned it.)

Just because she's my character doesn't mean I don't consider her evil. It's fun to play as a villain sometimes.
That's pretty much exactly what happens. The Chantry does not like admitting their ancestors or their allies' ancestors did anything wrong ever. This isn't even the best example of that: that would probably be the last paragraph of the Daughters of Song codex, where they try to make Emperor Drakon out to be a hero for massacring a pacifist sex cult.

But anyway, it is worth noting that selling the Dalish scroll to the Chantry doesn't involve murdering anyone. The worst you can say about it is that you're stealing stuff that rightfully belongs to the Dalish: it's from a Dalish ruin, so it probably should go to the Dalish. So I wouldn't say it's quite as evil as murdering Genitivi.I'd feel weird erasing stat or ability allocations on a companion: the most I've ever done was switch Sera, Blackwall, and Iron Bull's weapon choices so that Sera was dual-wielding, Blackwall had a greataxe, and Iron Bull used a sword and shield. And I did all of that before I'd actually picked any of their abilities, so that I didn't have to choose between re-assigning points and letting them waste points.

The one character I had who usually used Zevran was a rogue, and she handled all the lockpicking herself and just let Zevran stab things for her. (This is the same character who killed Genitivi, although I don't remember if I brought Zevran along for that.)
I don't know if I'd agree with you that Bioware's made all non-Andrastian mages out to be evil recently, or that the Andrastian ones are immune to that treatment. Vivienne's the mage I'm most worried about (apart from Solas, the surviving Magisters Sidereal, and whatever the Evanuris might have become over the millennia they've spent locked away) and she's an Andrastian who got control of the system (potentially to the point of being the Divine) by being exactly what it wants her to be in a lot of ways. There's plenty of reason to worry about the evil cacklers among the Avvar, but most of their mages are just people going about their lives. And while Dorian admits that pretty much everything we've been told about the Tevinters this whole time is true, his debut in DA:I was one of the first reasons to believe that that country's upper class wasn't entirely populated with cackling villains.

And the two Dalish keepers we saw in Inquisition are the two most sane and reasonable Keepers we've directly met so far: you don't see them creating centuries-long werewolf curses out of understandable hatred taken too far, or becoming abominations because demons whispered probable-lies into their ears, or binding uber-demons in the middle of their own camps.