New feature or functionality

When I work on one or more documents, I'd like Painter to have some way to manage them, such as showing each one in a tab (like a web browser)

I'd like some way for Painter to remember the recent colors I had selected, and provide them for me near the color wheel.

I often use PaintShop Pro for editing and making adjustments to my images. Would be good to have file compatibility and be able to transfer .RIFF file or .PSPimage files between Painter and PaintShop Pro so I don't loose file data when transferrin...

I'd like to see layer masks improved, so I can do things like move or copy them between layers and link or unlink their movement with the parent layer. I'd also like to see improved brush compatibility and be able to apply effects and adjustments ...

Often work / create on the go and would be ideal to use Painter on iPad/mobile instead of using another app.

The purpose of having this setting is to allow a user to change multiple but separate areas of identical flat color throughout the illustration with one click of the Paintbucket. For example, if you have a character who appears in multiple panels ...

Option to fill with a color quickly (and also gradient, pattern, weave, etc) simply by hitting a single key on the keyboard but without the Edit/Fill dialog box opening.

Ability to open multiple images in reference image panel, zoom in and out of reference image, preview in greyscale, ability to rotate.

Enable RYB mode so that blending two or more colors, results in more natural looking colors. It would be nice to be able to mix Yellow and Blue and get green or Blue and Red for a purple.

It would be useful to have the possibility to merge the canvas with all the visible layers above it, into a new layer which should appear on top of them.