well, as far as Greek is concerned, we're basically the same as the French and Spanish [sorry, those are the other languages I know, so the only ones I can compare to ], which, and i find it really odd, doesn't suit me. I've met a couple of Greek dominants, I just couldn't bring myself to speak to them in the plural, it ended up in me having giggling fits and them glaring. It just doesn't sound right--although in French a 'vous' comes out much more naturally than a 'tu'.
Concerning capitalisation, well... I don't do it. And i don't really like it, either. I find it's kinda faking it, i really do like the saying 'respect should be earned and is not granted' and that goes for everybody in my book. And, to be honest, i don't believe that i show my respect to anybody by capitalising their nickname.
Maybe it's also due to the fact that i'm used to typing and don't bother with capitalising even the 'i' unless it's at the beginning of a sentence. Word does it for me, lol.

--no offense to all of you who capitalise, i have nothing against it, really, just not my thing--