Those lists can and have been wrong, or a user may want to use a site even if its on the list. Without exclusions the users is forced to turn off network protection - which is bad.
On the script side, some trusted sites generate a lot of scripts. Would be great for users who uses those sites to exclude them and avoid the latency/cpu hits.
Did you look at the date of the thread/last post (March 2011), and Avast version (6.0.1021) of the thread you posted in? This isn’t even for the current version of Avast, which is now v.6.0.1125.
Yes, it’s 1125 and it has the same issue. No settings for for script shield or network shield. I chose this thread to comment because it had the most discussion and the most recent discussion on these two issues.
Personally if I was starting the conversation I would have started a new thread rather than posting it in a version announcement, but I didn’t and this is where the discussion and the people involved in it were located.
But hey, I don’t want to ruffle anyone’s feathers, so copied my post and quote to http://forum.avast.com/index.php?topic=72318.msg649682#msg649682 which is also related to this subject. Unfortunately its even older, so maybe I can look forward to someone commenting on it being an older thread there also :).