Here are some suggestions. Maybe I haven’t discovered all of the existing functions of verve and my suggestions are already in there. For sure most of my points were mentioned before:
1.) More undos
2.) With double-click on a knob it should be possible to type a number for the value. To keep it simple it would be sufficient like in sketchup. That was mentioned before because it seems to be tricky for you with an extra popping up window
3.) Show the wetness of the paper. That's in Rebelle and in Expresii available and very handy.
4.) Dry only the paint, not the canvas with a button or hotkey
5.) Tilt the canvas. That's solved both in Expresii and in Rebelle very good. In Expresii you can see on a smaller copy of the canvas not only the tilt (and change it there in three dimensions), but also where the water is. Deep blue is very wet, lighter blue less.
6.) The Brush in Expresii is for me the most advanced of all programs. Because you have also a length of the bristles. It's also better to see how the brush will react, because you see a 3d-brush at your brush-tip which changes how you hold your pencil. For example the long brush with much pressure gives a wonderful feeling and changes the contact-space, especially if you turn it around. Then the bristles flip around like a real brush
7.) When I see youtube-tutorials of artists with traditional media, they all have a mixing-palette. That's also available in Corel Painter.
https://www.youtube.com/watch?v=a3ylY9jMN3E There they mix on the fly some main colors to new ones. But the interesting of that is, that they often have several colors in one stroke (dirty brush) and can make fancy things with it. With Expresii it is possible to load several colors with several strenghts in your brush. Also you can store these brushes. But I would like to have a separate area where I can put for example a yellow and a blue. Than pick up some of the yellow and a tiny bit of blue and bring it together. Then see how it reacts and put my brush in it. Or put some more water in it to make it more transparent.
8.) In Artrage you can put your brush virtually in a glass of water and then clean your dirty brush.
9.) Name the layers
10.) It’s difficult to see for me which is the active layer.
11.) Show tooltips for all buttons
12.) Make the canvas wet from nearly no wet to really wet possible (by clicking several times on a button)
13.) The Color Swatches are great, but it would be nice to save the transparency and the amount of fluidity and we are able to see it in the swatch for example with numbers within the color swatch
14.) I know the program „ontopreplica“, so that I can position a reference-photo ontop of verve. But an inbuild solution would be even nicer. In Rebelle for example you can produce a color-palette out of a picture. That’s for noobs like me very helpful.
15.) I work with a 27‘‘ Wacom Cintiq and I would like to make the UI bigger, so I can hit the buttons better
16.) I want to store brushes or have some premade to choose from. The classic ones like pencil, watercolor, oil paint and so on.
17.) In Expresii it is possible to have a round or a square brush
Windows 10 professional, Notebook with Intel Core i7-6700 4Ghz, 32 GB RAM, GTX 980 with 8 GB RAM, Cintiq 27'