You can't get any file upload form there, until you specify a forum (since this is strictly specified in file upload options...). But specifying a forum is already 2-step procedure. Either you go to forums and enter new topic there with file upload form, either you choose the forum on the first page from dropdown and reload the page again... So, you enter new topic w/o file upload from the first page. I think, this is not the solution exactly for you... only for those who is not using file addon.