Hi Salvatore, thanks!

re:
> I wonder if there is way to add in the object snap panel the option ALL/NONE, so that I
> could deselect all the options with just one click or quickly go back to all the options
> selected. Hope this is clear...

Try using right-click on one of the object snaps. That will toggle all off except that one and if you repeat it on the same checked one it will enable all.

If you want to turn all off, it's better to disable object snap entirely by clicking on the main button for it to toggle it off.

- Michael