Going through some more notes this weekend and specifically I was looking for information on dribble penetration in a 4-out 1-in. From the dribble drive offense, you setup with the 1-in post always on the weak side. But I don't think it's always realistic to expect that in a game situation that will always happen. From these fantastic set of notes compiled by Zak Boisvert, here are some general penetration rules you can use for any 4-out 1-in motion offense, this is taken specifically from Rick Majerus and his 4-out 1-in motion.

Baseline drive on an empty post:
Nearside high elbow (O4) cuts behind for crackback (should be man to a man and a half behind ball). Farside high elbow (O2) drifts to vision (“It’s not a spot. It’s a “can the driver see me with his eyes?”). O1 sprints to corner for drift. O5 diagonals up to the front of the rim right by the front of the rim and should look to attack, but can settle for soft jumper (no bounce passes made to this big - everything going to O5 in this situation should be a chest pass — conversely a bounce pass on the baseline drift pass O3 to O1 because it’s extremely tough for v-back man defensively to get his hand down when covering sideline).

If such a baseline drive were to happen while a stagger was being set, the first screener (O2) would head to drift spot on first sign of penetration. The second screener (O4) who had taken a step towards stagger circles for crackback. O1 would “drift to vision.”

Middle drive on an occupied post:
(Perimeters should never be afraid to drive an occupied post. It’s their job to get out of the way). O5 would move foot closest to driver (right foot in diagram) and turn his body momentarily to head to baseline. O5 would turn to open and
call O1’s name (must make a verbal call).

Baseline drive on an occupied post:
O5 makes space by again lifting the foot the perimeter is driving at (left in diagram) and runs to the midpost area, curling to face O2. O5 should again make a verbal call and if O2 does throw this pass it should be a hook pass. On O5’s catch: shot (if he can shoot it) or a dribble handoff/pass to the nearest perimeter followed by an elbow angle ball screen (run a flare on opposite side—who’s going to help?)

For the complete explanation of this motion offense, take a look at Rick Majerus' 3-set DVD on the Encyclopedia of Motion Offense. Coach Majerus is currently the head coach of St. Louis.