I've been using mtPaint for a month+ and find it to be a very capable application.
There are three things that I still can't figure out how to set though:
- How do I have a white background as default (I always have to choose invert)?

- When I draw I always have a small shape next to the cursor, like a box, I find it surprisingly annoying. Any way to turn that off?

- I wish there was an 'eraser' function. I often don't want to just delete the entire, last lihe drawn - but a chung of lines drawn 5 mins ago, etc

If anyone knows how to accomplish any of the above I'm all ears.