There are applications which are not IPv6 ready or provide IPv6 functionality through an external tool. That is a relic of the past, we still drag.
IPv6 support should be transparent in programs, and programs should be modified to auto-detect IPv4 or IPv6 addresses and perform the expected actions.
Count me in. :)
Merging into the other tracker bug.
*** This bug has been marked as a duplicate of bug 883152 ***