Yes, I think those sorts of indicators would be important. I would also indicate that the practice with ISC, as I understand it, is that when redactions are made it's not just a series of asterisks, which gives you no indication as to the volume of redactions, but there's a blank space, which communicates exactly how much has been removed.
I would also flag for you the practice in, I believe it's Australia, where if a redaction is made, notice is given to Parliament.