If it's a voluntary list, then anyone who wants to be on it can choose that of their own free will. But displaying it to your entire contingent isn't a smart move. Should you do it, then everyone who is on the list should have access to it, too, and the names of every person who is allowed to see it. To keep things fair and even.
[Sorry, Suzaku, part of this is him being contrary, and another part is that living as long as he has makes people realize that when words like "registration" for a singled out group get thrown around, it's the start of going down a slippery slope of no good. Those kind of things always end badly for whoever ends up on the list and if--when Cherry gets back, he doesn't want to have to explain that he set him up to be labeled a monster...again.]