I'm not sure if you're referring to my thread, because I didn't make a downloadable tool or anything like that, but I made a small online web page which can merge plugin layouts - this lets you take a custom layout from a previous version of Sonar, and the factory-installed layout from your latest version of Sonar, and export a new layout that contains both.
However, I wrote this a year ago, for X3, and although I think I tested it with the first release of Platinum, I've not tested it since then. So it may not work, or might create broken files, I don't know.
It also makes no attempt to group things 'sensibly' - you just get the 2 layouts added together, and then you'd have to move things around according to taste.
http://www.twilightsembra...onar/layout_merge.html I don't know how the changes in Jamaica Plains relate to this - it seems like there haven't been any new VSTs shipped with Sonar for quite a while, so I've not needed to think about whether I am 'missing' any new functionality from my custom menus.