The wish spell is sort of on an event/timer effect. If you cast the spell off a reload, you get the same choices every time. Therefore, you need to 1) wait a few mins or 2) cast another spell/attack someeone...
I also found killing off most of the bad guys quickly, then running upto the top area and locking the doors was pretty useful... at least it gives the group a chance to rest unmolested.
