YES, blender right click to abort operation and left click to accept is more convenient, why even we have this blender like hotkeys if we don't allow to use it in blender like style

I completely agree! It isn't just annoing, it also costs so much more time while editing control points and it isn't a good workflow feeling. A selected function should stay active until I choose another one : )

Double left click in empty space does the trick.

I don't think this is necessary. It's a bit odd at first, but you get used to it and it's partly there to give you the opportunity to type in values for precise editing. It's a fairly elegant way to make sure things are how you want them before you commit them.

I think that would be great as well - More like in Blender where right click is abort - which makes more sense in my opinion.