Color Fill implementation without new tool.
I know there are a lot of suggestions for a fill tool, but my idea would be to implement this feature without a tool.
After drawing a Diagram/Shape/Whatever that you want colored in (completely, not shaded), it's always a real hassle to fill it in manually using the pencil. Adding another tool like a Paint bucket would make it easier, but still a bit tedious. In my opinion, the best way to approach this, especially for the Apple Pencil, is the Way Procreate did it. you can just drag a color from the Menu par, and drop it on a surface to fill it in. Here's a video showcasing it: https://www.youtube.com/watch?v=v3xalseUNn8&
I added a very rough sketch to show what I mean in Goodnotes.
I'd really appreciate if you considered this Idea.
A function which allows you to hold down onto a color and move it into an object a circle for example to fill out the whole object with that color. To have the chance to fill out every object afterwards when you're done drawing a bit more complicated stuff and you love to color it then.