Can you write a program to identify all those posts and exclude them in the post or the activity count?
If could do that I wouldn't be moderating, I would be working on the next google.
That sounds like something I could write the logic for, but in.... English. Maybe the guy who wrote the account value estimator could write something which pings an admin if an account checked with his service meets to many low post quality criteria
https://bitcointalk.org/index.php?topic=1142314.0.