Paint.NET :: Saving / Loading Only Selection / File Open To A New Layer

I was wondering if there might be a way to add the option to save a selection to the disk? when i work i create many selections with complicated shapes and areas.

since i need to use them more then once i was wondering if a feature for saving only the selection can be implemented ? this would enable me to load the selections to new projects and use them there making the same "print" every time.(my work around for this is saving a B/W picture of the shape then uploading it every time i need it , then copy and paste to a new layer

in the new project then selecting the shape area then flatting the image with the selection and deleting the internal area or the invert ) its long but works.if you can add "File Open into a NEW layer", this would save the need for part of my work around. i would then just load the save to the new layer and use it directly :-)

* This would be a great new feature anyway "File Open To a New layer" ... :-)

I saw this the save/load selection feature the other day in a photoshop presentation and was shocked that it's real :-)So if such feature can be added to paint.net even in version 4.0 it would be great and time saving too.