I get this comversation is a bit old now (a year)
I recently did another playthru and honestly, I still can't get over the fact how much you loose if you go sorta evil.
Nere seems to be much more significant that he actually is. At least as much as Jaheira is.
Making Nere new companion for evil characters would be great. I know it would require getting the voice actor back to record some voice lines, but that's pretty much it. If they make him be recruitable only if you actually play evil that could limit the possible other companions you have. So it wouldn't require all companions to have anything to say about Nere. Maybe only Minthara should need some interactions with him. But the rest seems to not really aknowledge Minthara either. So Nere too could be "ignored".
Nere has musical instrument, weapons, tadpole, shoes. He is pretty much set to have regular gear as other companions. He could use Absolute Outfit as his camp clothes - would be nice to see that piece of clothing actually used.
I get that there are more liked evil characters. However, most don't really seem to have no reason to join you and/or don't offer anything new. As it was already said, male drow, faithful to Lolth. It simply makes him way more interesting than any other regular human/half-elf mean person.
Not to mention getting him as companion would make it feel earned, consider that it means we have to not deliver his head/not finishing that quest.