For the drawing mode Freehand & Line I feel there should be an option to increase the amount of time before the line activates.
I say this because while drawing with it enabled I tend to pause for a few moments, which results in me creating a Line when I don't mean to.
On a related note, while in this drawing mode, if I draw really slowly, the line still activates (rather than activating after I get to a complete stop and holding for few secs). I don't know if this is a bug or not, but it's annoying when I want to slow down and focus on a particular detail.
I like the idea keeping this drawing mode on, so I feel these could be a beneficial additions in the future.