Hello guys! It's awesome to see how you are improving Spine in each new update. Congrats and thanks for your amazing work.
However, there's a bunch of things that are still problems for me, and I would really love to see fixed. Hope it helps!
My greatest difficulty is still working with the organization of the layers in the dopesheet.
Although I have developed a "method" of work that helps me to better visualize my position (using empty bones, colors and symbols), it is still uncomfortable to work with characters with many bones.

Although I know that I can block the order of the layers, see each of the bones separately and create selection groups, it would be great to be able to organize the dopesheet in folders.
This topic was discussed here: http://esotericsoftware.com/forum/Spine-Editor-Feature-ideas-requests-9211?p=41704&hilit=+folders+dopesheet#p41704
Adobe Animate has something similar in its timeline, and allows you to group content into folders (although it does not work with bones, but it can serve as a reference).

And Adobe Photoshop also allows you to choose the color of the folders. This could be very practical when you need to quickly visualize the content.

Also I really miss being able to see the bone path in the "ghost editor".
When animating, the route that the curves draw is really important in many cases. Some 3d animation programs, such as Maya, incorporate the possibility of visualizing the curve that the bones will make.
Although I know that you have currently made some changes to the ghost panel, always viewing the mesh is often a nuisance. I think that adding the possibility of seeing the curve that the bones trace can be very practical for most. I have done a small example image to give you some ideas, I hope it helps.

And finally, it would really be wonderful to be able to choose from a greater variety of bone icons. Especially to work in the dopesheet, the icons and colors are incredibly useful.
Another possibility would be to upload our own icons in PNG format, or create a "library of icons of the spine community" that we could send to approve, and download later from the web or through the program.
I hope these ideas help. You have a wonderful project, and it would be great to be able to continue improving it among all.
Thank you.