do the added options in the expansion affect the speed of the game?
I've played exclusively solo; 2 times without expansion, 4 with.
I don't think any of the new bits add to or shave off time from the game length. The expansion introduces mostly subtle additions that provide different ways to achieve the same core goals of the base game. So unless people really suffer from AP, it should feel like the same old game with a slightly broader (and more fun!) smorgasbord of actions.