This would help reduce complexity and overhead of VBAI state diagrams. Often states are created empty with the only purpose is to use transitions to skip or bypass other states. When a state is disabled, VBAI would skip the steps in the state and immediately evaluate the transitions. Any transitions which rely on results from a disabled state would be "results unavailable".
Would having this conditional disable for steps meet most of your needs? Seems like transitions can be used to conditionally skip states, but no good way currently to skip steps.