First, a welcome to this forum Kwiatek
I'm afraid comparing the DKS with Oblivion isn't that simple and for me impossible because the DKS is soo different !
Sorry to say, but in the DKS your hero have not the possiblity to sleep and wait for a few hours ... but yeah, you always CAN wait and have a break, eat some potatoes, ... look at a lovely barmaid and drink a beer or a wine
In the DKS you can make choices when you talk to NPC's and you can "mindread" NPC's too ! There're more ways to solve 1 quest ... you can choose to help a group of bandit or not ... but you must not join a specific "Guild" like in Oblivion.
Also the leveling-up system is totally different! So I hope you have NOT the expectations from Oblivion when you will start your own DKS !
Oblivion is good in his own way and for the DKS I can say the same,
apart from the fact that the DKS have very good humouristic acts, very great loot, very nice skills and many more strong RPG elements in my eyes !
Sorry I can't answer all your questions ...
