RIPADMIN questions

Mojn guys
I'm currently having some problems with one of our servers being denied
access permanently for abusive behaviour. It should be allowed to hammer
my whois service as hard as it wants, so I need to change some of the
parameters in RIPADMIN.acl - I guess...
I've tried to find some hints about this in the documentation found on 
http://www.ripe.net/db/docs.html but with no result ;-(

I found a workaround by changing the AC_* vaules ( "Access control" ) in
rip.config, but there must be a way to allow a single host unlimited
number of queries through the RIPADMIN database ?

Regards,
Peter