All of the available mouse and keyboard functions are listed here in the Paint.NET help file.
http://www.getpaint.net/doc/latest/en/K ... mands.html
I suggest learning them and learning them well!
As the story goes, when asked about his first 1000 failed attempts at creating a light bulb, Thomas Edison said, "I have not failed 1,000 times. I have
successfully discovered 1,000 ways to NOT make a light bulb."
Keyboard Shortcuts make the first 999 attempts at PdN greatness a little easier to get through...