limit user per ip in mod_dav

Hello, I have a question about the mod_dav Apache Module.
I limit a directory per user with the directive "require user", but I
want to limit the simultaneous connections with the same user.
Is there a solution for limit the access user to one IP, not multiples
IP's connected with same user.
I use the mod_dav-1.0.3p0.tgz module.

I hope somebody helps me.
Thanks.