I’m going to guess they don’t.
The reason is the heavy reliance on Alt key. In many locale settings, right alt is reserved for inputting national characters such as ąłóżźćńś. It works at terminal level, not application level.
This makes a fundamental action like 'select surrounding object ’ only possible with left hand, and my left wrist happens to be healing from a bicycle accident. Both shifts are easily accessible and bigger, and I’d rather have easily accessible backpedal than extending selection (more on that later).
Go back to word start ? Take your fingers from the home row or bend that thumb under your palm, baby!