Currently when protecting a page there is a third protection option labelled "Delete", which I presume is to protect against page deletion. Most wikis probably don't allow users other than administrators to delete the page, so such a protection option is probably useless to most wikis. There should be an option to disable it in ManageWiki so it doesn't clutter the protect page interface.

I raise this because recently the "Delete" protection option is, for some reason, listed at the top of the protect page interface, so that winds up being the first thing I click.