When creating an upload destination in EE2 is it possible to add more options to the "Allowed File Types" drop down http://expressionengine.com/user_guide/cp/content/files/file_upload_preferences.html#allowed-file-types as it only gives you two options "ALL" or "Image". This seems a bit insecure if you want to create a frontend PDF upload to have to select the "ALL" option.
What would be ideal is if I could make a file group and select the appropriate MIME types
Beyond hacking the core in many places, there is no solution to this. I'd suggest posting a feature request - it's a good idea (even if it was just preconfigured with a few standard filetypes listed with checkboxes).