Do you do pick choices in the Keep that you don't in the games?

Vex Hawke as a sociopath who killed literally everyone that could be killed and encouraged other people to kill people too. When he killed Anders, I cried. I actually really enjoyed playing an insane person in the end, became more of a Dexter character, but he will never be used in the Keep.

I'm never going to sacrifice the chargers. I'm never going to give Fenris to slavery.
Neer going to make Alistair a drunk or dead.

Hmm, getting off topic.

Sometimes I RP my Warden as being against the killing of Marjolaine. But I think she should be dead and it's an irrelevant choice anyway, so in the Keep she is always dead.

The first time I played DA2, I had to kill Fenris because not enough points. As I immediately then went to play DAI, I changed the Keep to say he was alive and well. Which was cheating haha he's never died since...

My first two times of playing DAI, I hadn't played Legacy. So, one of them got a "sided with Larius" and the other got Janeka. Other than a gender/name change it was exactly the same dialogue.

Let me think some more

Have a lot of trouble with Mal Cousland over Aeryn Hawke.

Mostly, I do not "cheat" in the Keep. I like my world states, but maybe I will create one different.

The DA:O is old enough, and my first Warden also (I created him when the game released...). Later I replayed DA:O and DA2 too.

I would do it if I missed the chance to do certain quests along the journey and after looking extensively at their background in order to give me an idea of the proper choice I would consider picking at that time.

For the most part, what I've imported are actual game states.

Exceptions:
I've imported a fake Hawke a couple of times for Fade bait. I have left actual Hawkes behind though, including in my first DAI game.

I created a completely fake world state of both DAO/DA2 where as many people as possible were dead. I won't ever actually play a game like that since 1) I don't like missing content and 2) I have a hard time being cruel in a game. I can be hardass, bitter, sarcastic, pragmatic, etc. but I can't kill people just for fun (ok, except that 1 merc guy in ME2). I hated my Hawke who sided with the Templars enough times to get the achievement. She romanced Sebastian.

No not yet. I've got 4 worlds encompassing most choices, as I want to live through it if I choose it in the Keep.
Once I'm done with the last world I'll then feel more free to experiment, but for now I have this strange urge to play through every choice or I'm 'cheating'. Stupid I know.
Which means creating some interesting characters who can do the 'bad' things and still be likeable.

I have only spared Loghain once and then he willingly did the ultimate sacrifice. However, I though it might be interesting to see his interaction with Morrgian and Kieran if he did the dark ritual, so I changed that in the Keep before one of my DAI runs.

I think the most alteration will probably take place regarding my DAI world states. Initially my Dorian romance didn't transfer correctly to the Keep, so I had to alter the outcome manually. Certain other side quests, like the one with the Crew didn't record in the Keep either, so I had to do that manually as well.

Then there is the Temple of Solassan quest that requires you to look through all those occulara in order to locate the shards. When I discovered how they were made I had moral objections to using them. However, since the quest was recorded in the Keep, I thought it must be important, so I took the trouble to find all the shards, only to find the final destination somewhat underwhelming. I cannot see how it is meant to be important in the grand scheme of things. So all subsequent run throughs I have steadfastly ignored those damned singing skulls but I shall alter the Keep to say that I did complete the quest (just in case it does have some significance down the line).

Generally I stay true to my playthroughs. I think I have inadvertently made wrong choices though. I set up my first worldstate from a somewhat dizzy memory and there were some things I couldn't really recall.

I have stayed true to my playthroughs as well, except when it came to DLCs, because I don't have all of them. So I go nuts there. XD

I made an entire world state out of choices that I would never pick ingame and I love being able to do so without actually having to play the first two games again. Said world state is called "As bad as it gets" and I picked all the -what I consider to be- bad choices.

I also love being able to create random world states and let the game surprise me.