psad: do not block access to HTTP

I want to block intruders via psad, but HTTP and HTTPS should not be blocked. For example, if someone is scanning my dedicated server via nmap, psad should block him for 2 hours, but he should still see the contents from my domain. I set AUTO_BLOCK_TIMEOUT to a value of 7200, so everyone scanning me is completely blocked for 2 hours. Woefully the attacker is also blocked from seeing my webpage, which is not my intention. Is there any possibility to set up a partial blockage via psad?