Keep annotation tool selected

[Perangelot]

At the moment, everytime you change slides, the annotation tool is unselected. Most of the time when you need the annotation tool, though, you need it for all slides, so it is a pain to open it time and time again. Could you make pympress's default behavior to keep the annotation tool selected until it is manually unselected?

By the way, I am experiencing problems drawing circle-like shapes with a graphics tablet. It does not seem to me that there is a 1:1 mapping as to what I write on my tablet and what is shown in pympress.