User blog comment:LoverofAllThingsCute/Wikia Feature Proposal: Special Priveleges for Rollbackers/@comment-2093602-20140726123021

If you dislike people abusing features on your wiki, I suggest adding some policies to prevent that. Of course you'll need to enforce them for it to work.

If you want to give rollbackers additional rights, you can ask through Special:Contact. If the abuse is high enough they can probably take away rights as well, but that kinda goes against the idea of a wiki, so they are less likely to do that. You can also rename the "rollbackers" group to anything you want by editing the correct MediaWiki message (in this case MediaWiki:Group-rollback).

The difference between rollback and undo is the purpose for which they are used. Rollback is meant to quickly revert spam/vandalism to a page. It shouldn't be used for legitimate edits that just happen to be incorrect. That is where the Undo function is for. Rollback is able to revert multiple edits at once, as long as the edits are made by the same user.

I also want to note that rollback doesn't erase anything, and will also create a new revision just like undo. Maybe you are using Special:WikiActivity instead of the more advanced Special:RecentChanges, which hides rollbacked edits IIRC.