Blocking root from SVN repository

I have read the posts about trying to deal with an untrusted root. I
know that there is no point in even trying. That's not my issue. My
issue is that sometimes I accidentally commit as root and files get
changed to root ownership blocking normal access to the repository.
All I want is something that recognizes root and prevents the commit. I
don't care if it is easily overcome by root as long as root can choose
not to do so. In other words, a warning would be good enough.

-- 
D'Arcy J.M. Cain
System Administrator, Vex.Net
http://www.Vex.Net/ IM:darcy@Vex.Net
VoIP: sip:darcy_at_Vex.Net