Circle and line drawing in a separate tool

[EbnedI]

There is an option in configuration named "hold to straighten a line" that is very useful but it often times screws up when coloring something.

I think it would be better if it was another tool instead of a configuration so you can toggle it on or off and it will also allow to add more figures to draw like triangles, squares, etc.
In that regard, a circle can be the first option to implement because you can draw almost any figure with just a line and a circle.