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Hey, I'm not sure if this is resolved for you, but as you suggest you can do something with robots.txt. Specifically, you could use wildcards to capture these URLs and tell Rogerbot (Moz's crawler) to ignore them. Here's a great Stackoverflow query to get you started and details on how block Rogerbot, you can take a look here.

This is very helpful Chris.Menke (and SamWebber)!  Thank you for the feedback and insights.  What we have been frustrated with is that we know we are building quality links on high-ranking, authority domains, yet it seemed to us that Moz was not learning of these links.  What we've tried to understand is how Moz discovers and adds these URLs to its index.  Working on theory alone, that not all of them will be discovered or accepted for index, we just want to be able to tell Moz about these relationships we are building out there - hoping that it does move our metrics from where they seem to have sat for a while.  Again, the key issue is that we want to be able to use the Moz tools, but if we don't [get] the demanded "get results", the subscription isn't going to get approved!  Needless to say, we are working double-time to build quality links from great content, but - not being social media experts - we are sort of throwing stuff against the wall hoping something will stick.  Not the greatest strategy in the world, we know!  But faint heart never won fair lady.