Flickr2Commons is open to anyone to upload 10,000+ files from Flickr at a fast rate. A system for throttling would be beneficial. At the moment with parallel threads being used, it is too easy for less experienced users to create a very large batch upload without any plan or project for how they would be categorized or renamed.
A current contentious example of 15,000+ images uploaded by a user new to the tool is under discussion at https://commons.wikimedia.org/wiki/Commons:Administrators%27_noticeboard/User_problems/Archive_52#User:The_Photographer. The results have created a burden on the community and is discouraging for the uploader who acted in good faith.