Add roms to that list. I looked into it at some point in time, and possession of roms is in fact illegal due to copyright infringement, regardless of whether or not you own the actual cartridge. It's not a very sought after offense, to my knowledge, but I'd suggest not allowing it, just in case someone goes on a witch hunt.
Wrong. possession of roms is NOT across the board illegal (Jurisdictional rules apply, as ever). Downloading them is a grey area if you own a copy, but uploading and distributing is always illegal.