I wouldn't try to vote on all possible Flags. There's far too many of them, and ideally many different users should all check a few Flags once in a while to make voting more distributed.
I would like to have a one-click "advanced" option to oppose obviously frivolous flags, like the ones create by korner sockpuppets. It doesn't have to be all flags by a certain user but at least an option to select multiple ones easily and and then oppose all selected. The troll flags are basically DOSing the trust system since the effort to create them is so much lower than the combined effort of multiple users trying to oppose them.