Currently, the SocketIO development server can only include additional files, but not selectively exclude them during debugging. 

The Werkzeug reloader already provides a parameter to be able to exclude specific patterns, leveraging that ability, SocketIO would be able to do the same. An additional parameter was added the run() method has the same behavior across extra_files, exclude_patterns, and reloader_type

The same has been done for the reloader_type additional argument. Werkzeug lets you choose which reloader to use and depending on the architecture/machine it may be beneficial to allow explicitly specifying the reloader used.