And, this is for the wikis: global login in all? Would be useful, eh?
I'm not sure about this. The one thing that would worry me is that we have some users that have accounts on two or more of the wikis... There might be some way of merging the accounts globally (I think they call it Userpering on Wikipedia). If all of the wikis would agree to that, then that would be good.
But I don't want my Bulbapedia and MarioWiki accounts merged.
then don't merge them. If we did have some sort of a merge function, i don't think you'd be forced to merge them.