"Holding" right mouse is difficult for users without a dedicated right mouse button. Mine is mapped to browser gestures, so I can't try this. Would it be possible to add another activator that isn't already tied to common functions? The K key or something?
You can also tear it by being extra forcefull with the "pull" using the left button.
Nice, looks like a similar port I did a few months back. Based on the one made in processing :)