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L may go ball side when there is a reason to do it, like the ball is on that side and the majority of the players are too or the ball is on that side and post players move to that side.
It should not be done if the ball is being passed around the top and a team is shooting a lot of jumpers from the outside. You will just be yo-yoing back and forth and Murphy's law kicks in and you have a long rebound or a skip pass toward your uncovered side line.
There are primaries and then you have secondary areas where boundaries meet, so no it is not uncommon for an official to have a call outside their primary...especially from trail.
Those type of calls happen when a play starts in one officials primary and ends in the others. There are also times when the play is going away from lead and defensive help comes from the backside and there is little chance of the lead seeing the contact or violation. In those cases a patient whistle is required and trail needs to close in and give the call a little extra.
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