Thank you for your post, we will discuss internally the possibility of adding MrSID support.
Thank you for your idea, we are planning to implement this feature in one of the upcoming updates of georeferencer tool.
The active node is visible when you point the mouse cursor on it but we will review the idea and implement the color change.
To exit this mode is easy by clicking on the other panel (Overlay e.g.).
To improve this feature, please feel free to be more specific.
An error occurred while saving the commentzabak commented
Also, make it clear how to exit the cutline drawing mode. I had a problem exiting this mode.