Since english is not my native language, maybe I didn't explain it right, but if you look at these two videos:

this is what I want:
https://www.youtube.com/watch?v=Ux3_...ature=youtu.be

and this is what I have at this moment:

https://www.youtube.com/watch?v=NouO...ature=youtu.be

the logic of your program should update all cursors at the same time while you are performing the edit.
that's what I wish to achieve, but I don't know how.