OS-X desktop version
Suggestion for improvement:
When using the "Document/Resize Document" menu-item, if 'Resample' checkbox is not selected, the only resizing allowed is by dpi. (and it's limited to 400dpi using the slider).
It would be much more useful, when not resampling, to be able to specify the size desired while having the dpi calculated automatically.
Also, changing the size to input into the size box is cumbersome: Unable to select the digits with the mouse, the cursor must be positioned just right, then must delete the digits with the keyboard, before typing in the new size.