Nice! Best of luck btw!
I tested Lock View, and it does no longer snap to inbetween angles like SW, NW, W, E, etc, but it does still snap to the top and bottom? which imo it shouldn't snap to any angle at all when disabled since one would assume it gives full free control when disabled but it doesn't.
Also I think should be named "Snap View" or "Snap to Isometric"? Using the word lock sounds like it restricts your view when in this context its more like a helper, not a "camera lock". Also maybe add a tooltip for the right side buttons in general? It would help to make them a bit more clear.
About point 9, oki, so... Basically if you have your mouse on the model, click somewhere to draw point A, then move your mouse to another spot, point B, KEEP THE MOUSE STILL, and hold shift, it should show you the LINE it would make from point A to point B when you pressed shift.Currently, line mode only shows you the line that would be drawn from point A to point B AFTER you move the mouse after you hold the line button, but if the mouse is completely still, it doesn't show you that line connection.
About 13, ohhh, I was unaware, but yeah, I am used to just be able to just "Ctrl + Mouse Wheel" to change pixel size, and thanks! it will be helpful. In general, the idea is to make it so the user doesn't have to mouse their mouse off where they are painting, since it can get a bit tedious to go back and forward over and over.
OH, in that note, could you make their tooltips also tell you their bind perhaps? That might also be an easy way to make things a bit nicer too, since you just hover over and see the bind it has.
Also I know this is just me being me, but if you do ever need an extra hand developing the tool, in the form of PRs, suggestions of how to approach certain things, optimization tips (which I think you can tell I worry a lot about because it is also one of my favorite things to do when programming lol), or if you need help in general, I am willing to help as I myself develop apps, modding tools, games and tools for game development. If not, it's okey, but I figured to throw that out there. c:


