Les: Wouldn't you have to add a hidden 1 into it to keep it from showing up as a dial if you do it that way? If I'm not mistaken, you can also make a comment simply by defining a block that has a type Poser doesn't recognise:

            Comment ERC Definitions
                {
                    The following five channels are
                    controlled by ERC in the BODY:1
                    actor above
                }

As I discovered when I accidentally de-capitalised an entire block and lost all the dials except scale, because Poser doesn't recognise, for instance, 'twisty' or 'xoffsetb', only 'twistY' and 'xOffsetB'.