Thanks for the feedback. I will be working on more videos as the current ones are for the older versions, but my microphone has abandoned me again. I can't get a good microphone. This one was decent (on a USB headset), but stopped working properly and now is extremely noisy
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The Lines and Curves are working differently than in most other editors. I believe, stateless GUI is better for beginners and so the Line and Curve have only one state. When you create a Line, it has 3 points - two on the ends and 1 (greenish) in the middle. If you drag the middle point, new vertex is added. Similarly with the Curve.
I admit that the classic click-click-click-ESC way is faster when an experienced user creates a new line, but newbies have problems with it - they do not know that they have to somehow end the line (ESC, right click, ...?), changing a placed point or splitting an edge may be difficult, as it may involve choosing a different tool or re-configuring the current one. Though apparently, my approach confuses people, who have used other editors. I may adjust it or put some hits somewhere.
BTW for the Shape, the greenish points have similar function - they allow you to split an arc (without affecting a shape) and create a new control handle (point) at the desired location.