[development] Block user deletion

The issue is I need some users to be able to edit other users info but not delete them. There is no permission that I can see that allows editing of users profiles but not deleting them. My second guess was to write a module but I don't see anything in the API that will let me control user access the way I need. Neither could I find a way to block the deletion (I know hackish). Any pointers in the right direction are greatly appreciated.