Originally Posted by Chrest
Due to the lack of definition, I don't even understand what the OP wants.

I fail to see what practical difference OP has in mind. Seems to me that if he wants to focus on "secondary character" questline, and force the party to fulfill this one first, he can. He can even stop the game once it's done. What are the mechanics the OP wants?

Feeling like you are playing a multiplayer game when you play single?
You cray-cray.

What he wants in D:OS2 is what D:OS already had in a less sophisticated form. And since the "playing against yourself" mode already/still exists for QA and plain old testing purposes, not providing this option to players strikes me as... surprisingly petty.

Proud Probatanthrope

Tor.com: Boob Plate Armor Would Kill You (cf. "ball plate armor" - Just think about it.)