Hi David,
Unfortunately, there's no way to know if a view has STF enabled or not via PJSR. I've just added a View.isSTFEnabled property, which will be available in the next version of the core application, but for now... I can't figure out a trick to do this. Clearly, the ImageWindow and View objects require further improvements to get at least the same functionality that is now available with C++/PCL.
Sorry for not having a solution!
Welcome back, by the way!