OK, Thx, the numpad is workable.
But still remains the question why do HAT views work in the standard viewer and not in the film editor viewer?
This is not intended as a whine, I merely think it is handy to use the HAT system because we're used to it by use in flight and it works more natural (easier) in film review.
Big Salute to HT on the film editor, it is really nice to be able to instantly switch from player to player.