If you’re searching, use google search instead. These days you can just put ‘at boards.straightdope.com’ at the end of your google search, you don’t even have to go into advanced search options.
I agree this sounds like a good idea. I frequently have to wait to refine my search, because my first search doesn’t turn up what I’m looking for. Although I would vote for 3 searches then a 6 minute wait, if this were a democracy.
On the few occasions when I have been foiled by the 120 second rule it has been a typing error and the 240 second delay every second search would have served me just fine.
The problem with using Google is that it doesn’t always return complete results. I’ve just searched for one of my posts, and Google failed. The board’s search never fails to find the truth.