1b. More companions ( Huge part of BG was the banter between different companions , whether positive or negative.)
I believe in one of comunity updates Swen himself was talking about not having implemented all companions yet.
Im not sure here, but i believe he was talking about having right now implemented only evil or neutral characters ... and now working on good ones.
1c. More interactions between companions. I've seen few and small comments from one to another , but it seems most interactions are between the PCs and NPCs.
I would also like to see more tence interactions ...
For example in so many times mentioned Dragon Age: Origins ... some companions even become hostile if you did something they didnt like, as Wynn in mage tower, when you decided to wipe our mages tells you something like "Either you can join me, or get through me ... decide now!"
Not sure if this is good example, but i would like so see simmilar reaction (just not so extreme ... more like "one of us will not follow you anymore, either i will go, or she will ... decide now!") when you are helping Lae'zel with Shadowhearth in your party.