Sean,
I already brought it up with Cisco. Also with Steve Knowles when he
was an AD, but I never wrote an I-D. I was more inclined toward
trying to get an implementation. This was about 1994 if I remeber
correctly. Also brought it up with IBM before they stpped development
on the NSS but not for ATM, other bcast. Happens to be good stuff for
ATM, SMDS, FR. Carriers switched service perople might hate it. 
Curtis
ps- maybe one of us will have better luck now.