When u left click and hold it makes that lil line when u move, what is if for?
Can i select Vertecies and faces with it?
If so please tell me how!
It doesn’t do anything yet as far as I know but has always been there. Unless of course you first press K to activate the knife tool.
It’s called a gesture. a sort of mouse hotkey. if you hold the lmb and draw a straight line it’s like pressing [g], if you lmb and draw a circle it is the same as pressing [r]. There are more I think but I can’t find them in the docs. Anybody?
yes I think they have been there from the begining…
works for scaling to …
just have a object selected and make a quick move left/right <–/--> and the object will be scaled…
and if above but with MMB direct after that object will be scaled in that direction only 
It is in the doc too, “reference”
Stefano