The Gore Report recommended positive bag matching, xray for checked bags, better training and pay for screeners and instruction on how to 'identify passengers who are a security risk' (profiling). The ACLU objected strenuously to the last one of course. The Gore Report did not recommend banning of <4 inch knives or any other sharp objects, nor did it say anything about hijack-proofing of flight decks.
I'm unclear whether the terrorists were or were not identified by CAPPS, but none of the other suggestions would have made the slightest difference on September 11.