Originally Posted by petercohen
Thanks but I have no plan to root it for the time being.
The there is also this Floating Windows Shortcuts
app which with you can make shortcuts that opens directly to pen window. I use this on both my devices, Note 3 and NP 12.2 and I think it's awesome. With launcher like Nova you can make app icon to open app on press, and open in floating window on swipe. That's how I use it.
Then there is this MP-Pen App Enabler
. This app edits apk's AndroidManifest.xml from installed apps on your device and thus adds multi window / pen window features. Then removes old version and installs this modded to your device. Only thing here is you can't update those apps through play store anymore since MW-Pen App Enabler need to sign those apps again, with different signature than original apk of course.