First off, I want to say that this is by far the plugin I've used most for a few years now. Simple and easy to utilize. So thank you for that! 4 quick gripes/suggestions that you're of course welcome to take with a grain of salt:
-Undo/redo is very slow with larger adjustments
-The entire paint.net application will crash if your brush size is too large (~700px, which is sometimes needed for high resolutions) -- I've lost work to this
-Using the effect near the edge of an image reveals a "wall" against the edge that can't be adjusted
-I frequently find myself wishing I could liquify an image while still being able to see the layers above/below it, too
Again, I love all of your work, having made use of it for years now. These are just the wishes/issues I've encountered the most. But hey, it's free! 😛