Don't know exactly if this is a technical problem belonging here or a missing feature for bringing up in "Desktop Feature Requests"

If you work with command files you can trigger menu commands with e.g.:
MenuCommand "DVD\Lock\Title"
you would lock/unlock the currently highlighted title.

But MenuCommand "Collection\Nest Box Sets" does nothing, I'm not sure whether this is a simple oversight or if this is deliberate.

Another problem, and this is where the feature request might come in: the Lock\Title example shows a real problem: you can just toggle, there is no way to distinguish if it is on or off to begin with.
So for such toggling commands a syntax like MenuCommand "DVD\Lock\Title {ON|OFF}" might be better. This would also be needed for Next Box Set.

cya, Mithi