I couldn't seem to get it to import a random PDF file, despite that being one of it's primary features. Not sure what's happening there.
It's still no ideal: the program seems to require Java installation, meaning no jPortable option yet and I didn't see anything for LibreOffice Portable.
LibreOffice (installed) integration screenshot
I wasn't able to get it to work with Firefox Portable, despite the mention on the dev page.