AdWordsAdvisor says there is an email address that can be used to make enhancement suggestions.
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Thanks for keeping this thread alive, and for the ongoing suggestions.
As mentioned, I've been forwarding your ideas, verbatim, to the product development team. I've heard several appreciative comments from Googlers who find the direct advertiser feedback instructive. So please keep these product enhancement ideas coming!
I should have mentioned this before: you can also email suggestions and/or comments to the AdWords team at firstname.lastname@example.org. Please note that while you *won't* receive a response to emails sent to this address, your comments *will* be read by those in a position to make a difference.
Your thoughts regarding AdWords are both welcome and valued - and they need not focus on the 'positive' either. Feel free to tell us what isn't working, about features that would make advertising with AdWords easier or more effective.