Awesome, really look forward to it! ReaddleDocs is probably my top used program on iPad. I am also hoping you're thinking of adding iCloud support into one of your future releases
That is my exact complaint. With the way iOS sandboxes the file storage for each individual app - using separate apps for file management (ReaddleDocs), and advanced editing (PDF Export) is highly cumbersome, pretty much non-workable.
I think one solution could be for developer to enable "in-app purchase" of 'advanced PDF editing' functionality from ReaddleDocs. This way, those who use ReaddleDocs as their primary file management app can also take advantage of PDF Expert functionality all within the same app. I don't actually mind paying a few extra bucks for PDFExpert functionality, I just don't want to deal with multiple apps.