That's because I believe in explaining things.BAS ....you've already used 200 odd words on this post!
That would work if there was a legal CYA need.What about the 'pop up' suggestion from BigJon? hand the responibility back to the poster...
In practice people would click "I agree" without reading it - at least if you ask them what they said on their Building Regulations approval request you'll know if they're ignoring the issue.