FreeBSD Kernel and Username Length

Since I'll need to my FreeBSD 7.1 kernel to support quotas, it seems like a good opportunity to increase username length. Is there a recommended length that you would suggest? FreeBSD normally only allows 16 char usernames, and this is far too short to properly support user@domain style user names. Initial thoughts are that 64 chars might be sufficient, but others seem to have used 128. What is recommended?

Status: 
Closed (fixed)