The CRKT thing with Customs never surprised me much after their flap with Spyderco some years back. What happened then was some Civilians were imported and those that were serrated were impounded as switchblades, while the plain-edge copies were allowed through despite no difference in mechanism.
Sounds about as logical as anything ATF comes up with, although I don't know of anyone having hung a nickname on Customs the same way people refer to ATF as "F-Troop."
Given general hysteria, if you want a torsion-assisted folder, best to buy one now & hope preexisting models are grandfathered. As soon as some low-life legislator (I realize that's as redundant as saying "head hat") gets wind of them, there'll be mass hysteria in legislative sessions everywhere.
"...the only thing worse than a politician is a child molester!"--Rip Torn, to Nick Nolte, in "Extreme Prejudice," 1985.