Deleting on a wiki

One frustration I have found with the wiki: If students make comments on there that you would like to delete, you must do each individually which can take time. I emailed the wiki people to see if they give me a response or can change this. Most of the time you want the comments to stay, but if someone puts something dumb there, it would be nice to get rid of a chunck at a time, instead of one at a time.