Good questions, but I don’t think that has been set in stone yet Ephi, the guys are still working on stabilising the test network and establishing test net 2, the process of global updates and voting will be defined further down the roadmap.
Creating lots of identities (for manipulating votes, trying to gain control of the network, dump rubbish data…etc…) has been discussed quite a lot on the forum, one solution would be to ensure account creation costs the amount of safecoin that storing such an account costs. I personally wouldn’t want long running nodes to get a more weighted vote. If you work on the assumption (dangerous) that each account represent 1 user, I believe everyone’s view is as valid as anyone else.