I think the answer is that it's up to the unit to make its assessment of what its operational needs require. The substantive provision is found in clause 24 of the bill, which would amend section 148. That provides that there has to be an agreement between both the offender, the person making the application, and the unit to agree to allow him or her to serve the sentence intermittently, so the needs of the unit would have to be factored in before the commanding officer made his or her decision about whether or not they were going to approve that.
On February 27th, 2013. See this statement in context.