freejung - 8:14 pm on Sep 2, 2011 (gmt 0)

but what about the various things I block because I don't want a lot of sort=, pagination=, display= and other types of potential duplicate content cluttering up the joint?

Right, but the +1 button uses the rel="canonical" link if it exists to identify the target of the button, so all you have to do is properly canonicalize those pages and the bot should request the URL that the button actually points to, which will be the canonical unless specified otherwise.

Or you can explicitly specify the URL in the code for the button.

You still have a fair amount of control over this.

I can see how it's kind of rude in principle, but in actual practice why would you want a Google +1 button pointing a URL that you don't Google to see? Just make sure you're pointing the button at a URL that you like, which you probably ought to do anyway otherwise when people share it on Google+ they'll be sharing all sorts of random parametrized URLs that you don't like.