They can not ( And Will never) give people multiple teams in teh same public server though. It just wouldn't work/wouldn't be teh game its intended to be.
Thats only because they have installed the "you can only play in the country you live in"-rule.
Installing a second unit of the same game would be useless too as the traffic there would be pretty low I suppose. I dont know any numbers, but if 5% of the users are supporters and 50% of them would take a second team that would be a whooping 2.5k "second universe" - pretty uninteresting imo.