Testing the HttpLimitReqModule without blocking

Hi all,

I want to implement the HttpLimitReqModule within our setup to get rid
of people scraping the content of our page.

However, since some of our bigger clients are using the same proxy IP to
connect to our page, I need to adjust the limit before really blocking
users. Any chance to log the attempts without delivering a 503 page?

If some of the proxy users would fit into the blocking scheme, is there
a chance to define a whitelist?