I think that there should be more kits, and that pvp is enabled, not just at the pvp center. And there should be more voting links. Also, wouldn't it be cool if we could have multiple islands and buy ranks with ingame money?
There are already many, many, many kits on skyblock. Enabling PvP is an Admin only feature and it will likely stay that way. Minetime has votifier set up on a few of the more popular server lists and it would kind of be a waste to set it up on more. The current issue with skyblock is that there are just way too many islands already, having people with multiple islands would just make it worse. You can only get Donor ranks by donating and it will stay that way.
Its a really weird command, something like /region flag on Something like that, I've never done it so I don't know. Its under the admin donation board perk like Jess said. Although, one person told me they did that and it enabled people to grief his island, but I know Serial did it and people couldn't grief his island, weird right?