Override the 16 chars username length

[Stefano Marinelli <postnet%dragas.dyndns.org@localhost>]

Hello everybody,
after some tweaking, I've been able to install a fully working Virtualmin on a 
NetBSD-5 host. Everything is ok, except importing already existing domains from 
a Debian Virtualmin installation.
The problem is that Virtualmin, on Debian, created long usernames while NetBSD 
refuses to add users longer than 16 chars. On FreeBSD I was able to modify some 
lines in the sources and solve the problem, is it also possible on NetBSD? 
Where should I look?

Thank you,
Stefano