Jim; there are times when a player doesn't want to find the first ball. All you are doing is reversing the duty. Under your prposal, he would have to declare, "this is not a provisional, this ball is in play". The current rule is not dissimilar from a player putting a "second ball" in play when he is in doubt as to a rule. Rule 3-3 establishes a procedure and there the player declares which ball will count if he is permitted under the rules to utilize that ball. Not that far from declaring a ball to be a provisional, the player is merely selecting the ball he wishes to count if he has the option to proceed.