The comment period is open until May 1st. I encourage everyone to register their concerns with them. According to the ATF:
Comments will be accepted from 01/31/2011 - 05/01/2011 and may be emailed to: email@example.com or faxed to (202) 648-9601. All comments must include a name and mailing address.
I'd also encourage everyone to get in touch with their legislators regarding this. The Bureau is under a great deal of pressure, and their budget is up for renewal soon. Now would be a very good time to suggest that they not tie up their scant resources on something like this.