I've killed the chat option, but I frequently see users loading more than just one file. I tried a REGEXP to see if there was any logic for downloading the lot, but just incidently I could see the logic. (Example, people tend to download in alphabetical order: Abba -> Bowie -> CCR -> ....)
Also, limit uploads to 1 per person would not prevent people from spunging my harddisks, it will just take them longer to get 'm all!