Please please please change "Un-delete" to "Redownload" or something. It just seems weird, and you don't really see the term "Un-delete" anywhere else. If you really insist on keeping it there, just remove the "-" to make it "Undelete" please. Or just don't have deleted addons listed at all (because deleting add-ons delete the add-on, right?)
Or does it already do this, I have not tried the control panel yet.