Why NAV/NIS 2009, Norton Insight, don't trust other security tools?

I think it can make a better compatibility if Norton 2009 product's Norton Insight trust other security tools (For example other Antispyware, firewall and...)

Why Don't do it?

another question, if I  set a folder in auto-protect Exclusions, would it help me to improve performance like what Norton Insight do? for example if I set Threatfire installation path in auto-protect Exclusions, would it load and work faster?

Also, I want to know how I can offer Norton a program to scan and decide to trust or not

Hope I get a good answer from who know why Norton don't do it...

Message Edited by boelectronic on 01-01-2009 04:55 PM