Those are all good questions, and my answers are, in order: I don't even
know if we're bothering with the voting part or just implicitly
accepting them as voted approved when they're made blue; yes, it's part
of the wiki, you just have to add the poll to a page if you want voting
on something in it; I don't know if there is a such thing as "official
leave", but I'm pretty sure voting is a simple majority and we don't all
have to vote at the same time, just whenever we get around to going to
the poll and choosing our response, so it could take as much as a month
to get all the votes depending on personal time constraints; not at all, no.
Votes on non-administrative issues are consensus minus 1.
Votes on administrative issues are 2/3 majority. A vote on an
administrative issue may be called at any time by any member, and
everyone, including the jatna, is bound by them. The jatna strongly
prefers that you take any problems up with him first, however.