Anyone can fight vandalism on the Commons (one-click revert is available to any logged-in user). If you want someone blocked, ask in #wikimedia.commons. If you want to be able to block users yourself, establish a good track-record, then apply for adminship yourself.
Not every can use IRC
Yes, the Commons is a repository of Free media, that can be used by any project. What's that got to do with adminship?
Dan
Nothing if we reupload everything localy. However if we don't you have become part of wikipedia thus it is legitimate to expect that admins should have the smae abilities there as long as they limit themselves to wikipedia only matters.