Ignore exists warning when reuploading
Users of commons find it annoying to have to double stage all file uploads or to have to always check "ignore all warnings".
I was thinking it might be a good idea to always ignore the "fileexists" warning when the reupload option is used and the "fileexists" warning is the only warning. Possibly extended to only do this for registered users and given unregistered users the warning at all times.
I have added a small patch to demo this behavior on a wiki.