We shall have more companions in final release ...
Im not quite sure Larian plans to implement them during Early Acess tho.
Custom party and Mercenaries (is that the word?) systems were also allready confrimmed ... for the future ofc.
Curently there is option to get custom party with multiplayer ... i dunno how to call it in english, its not exactly bug, just a way to bypass game mechanisms.

3. Make the companions you already have have two alignments/personalities. Let the player decide which should be used.
Im affraid this would be impossible ...
Those characters we know *so far* are simply tied too tightly to their personality.
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I would also like to take an advantage of your topic to repeat my big dream of prefferably two Origin characters per class (good and evil) ...
Or at least one ...
And also Non-Origin companions ... wich would be great addition to our party in my honest opinion. :3