As I mentioned before the program is great.
But I came up to a minor issue:
When I have the Customize Blacklight window open and click in this window to change a setting, coming back to the drawing canvas, the cursor will appear as an arrow. So it is not clear what tool is used. I would expect it to return to the last used tool (pencil or erasor).
I can only change this by choosing another tool or hitting the comma on the keyboard.