increasing username length via MAXLOGNAME and UT_NAMESIZE

[freebsd-questions at andrewsupdates.com]

Hi,

I have read the adduser man page which states the following:

"You can change UT_NAMESIZE in <utmp.h> and recompile the world; people 
have done this and it works, but you will have problems with any 
precompiled programs, or source that assumes the 8-character name limit 
and NIS."

I have had a hard time finding examples of anyone who has actually 
increased the username length to something like 64+ characters though.  I 
am wondering what if anything (besides NIS) might break on a freeBSD box 
running virtual domains with 
postfix/courier/apache/squirrelmail/webmin/etc.  Has anyone actually done 
this and if so have you had any problems?

The reason I'm looking at doing this is to support user at domain.com style 
usernames (POP/IMAP/Webmail/usermin) without using a MySQL or LDAP system 
for authentication.

Thanks,

Andrew