Proper way to coach this?

[Rob1968]

Coaching ideas:
Always have your players run to the inside of the officials.
Practice a secondary break, by having your two leading, wide players cross, under the basket, and set up for the wide endline shots, on the opposite side of the floor from where they started. From that set, you can then run your offense as usual. (Defenders often act as if there's a wall at the basket, side to side, and will often ignore the player who has crossed.)
During practices, when working on having both players cross, decide which side will always cross behind the backboard, and which side will always cross in front of the backboard.
A variation is to add a side pick, and on cue, your signal, on a particular fast break, the endline side shot can be facilitated using a single crossing player, and a pick by his teammate on the other side. A slightly different version has the crosser setting the pick, midway between the side of the key and the 3-point line, and then his teammate using that pick to drive the endline to the basket. This will also give an opportunity for the delayed teamate, usually a guard, to set up on the wing, opposite the pick action described, for a second pass, from the driving player, and a jump shot by the guard.