3- In the Sketcher plugin you can select the top points of the shape
and drag it to other coordinates, so you can easily change the shape?

You can do this already. Make sure the "Drag" button is checked on, then click on an existing point so that it will turn the color red, finally hold down the Ctrl key and the Left Mouse Button while moving. If this is not what you meant, let me know as maybe the Help checkbox information is not clear.

1- Is it possible to make the Videoscope plugin act globally on the
compositor window, without the need to apply it to a track/edit?

Will have to see if GG understands this request. The Videoscope definitely needs work but one of GG's least favorite topics. I will add this explanation to BT # 71 so it can be addressed while working on that.

2- I don't remember if it had already been discussed. In resource
window, when creating one or more user bins, you can also create
subfolders, i.e. nested inside the main folders (Media and Clip). And
the subfolders can also contain other subfolders. In practice:

-clips
-user bin 1
-user bin 2
-user bin 3

I do not remember any discussion about this. It could look something like the Video Effects explansion display for Color Correction, Motion,... I am assuming that this might be do-able so it will go in the list of possibilities. gg/Phyllis