No.. the moves ARE NOT legal. And it isnt rare just because YOU say it's rare. They are not legal because the rule IS: if you CAN use both dice, you MUST. Regardless of whether you like it or not.
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)