Sometimes these posts get answered via email and don't get followed up here. The short answer is that we have a beta that lives in the menubar and does dim displays independently. Its not very polished and has been sitting on the backshelf for some time. We do hand it out on occasion to those that want it bad enough, but it is a bit untested.
If you are interested in receiving and testing a beta that can dim displays independently, just email us at
customerservice@splasm.com and we can send you a download link. (its a bit too messy to make publicly available at this point.) Thanks for the question!