let me thank you for this nice software first and here's ony my suggestion that could make it even better.
If I add any object, for example an arrow and if I need to add another arrow then I must choose it again on the toolbar. Might it be possible to keep the same object selected? Now it switches to object select mode when an object is created which is off course good for adjustments of the object but some combination like if mouse is over the object then allow adjustments of that object and if the mouse is anywhere else (=not on the object) then keep the same tool selected so we can add another object of the same type. This works for example in SnagIt and I miss in SC a lot
It even looks like this should be working already because when I add eg shape object and move away from it I can still draw another althought object select mode becomes active - but when I drag mouse now still the rectangle borders appears following the mouse but when I release the mouse the rectangle is not created at all.