Who hasn't roleplayed through icewind dale at least once in his life ?
I remember building a gay cleric once in my party. He fell in love with Arundel at first sight, but his low charisma meant that the archdruid wasn't interested. He decided to do penance after he almost broke his vows by traveling Icewind Dale naked. He although lost connection with his deity. I had to play with no armor and no spells, it made the combat quite difficult, but this kind of sacrifice is what we play proper crpgs for !
No but really, where are you going with this nonsense ?
Well, if someone does that it would be a bit extreme.
If you spread your points thinking about the character and not about the mechanics of the game, and if, in certain moments while playing you take a second to imagine how this character might feel or react, that would be roleplaying in a videogame, and at least to me, that's the limit to which it can conveniently go.
Another aspect of roleplaying, inventory management: I usually use my priest or mage to carry scrolls in his inventory.
Weapon specializations - more opportunity for roleplaying. Who uses what weapon and why?
Custom portraits, another aspect of roleplaying.
All in all, especially in the case of IWD - you could set yourself up for some roleplaying in the same way as in Battle Brothers.
The major drawback of this style of playing is that you need to have a concept of the party in your head. I know this is difficult for some people.