It could be made so that a nickname is automatically selected per-page. This way threads he comments in could be followed. A small pool of 5 or so names could be reused so that he couldn't be exposed by finding the user that has just been created.

Example implementation:

     unames=['bob1','bob2','pg']
     lu=len(unames)
     secret_seed=309580435

     from binascii import crc32
     def hash_eq(number):
         return crc32(str(number),secret_seed)

     def get_uname(page_id):
         return unames[hash_eq(page_id)%lu]

A checkbox for manual override could also be added.