Say you lnk several FFCs to a master ffc (necessary to move large numbers of FFC around as a single unit), and the master ffc hits a changer. The master ffc's movement will change and the linked FFCs will change as well. But the linked FFCs don't seem to be effected by the Increase Combo ID flag.
FFC Changers Don't Change Linked ID
Not a bug. As far as I know, FFC linking was specifically designed to only apply to movement.
Ah. Well, time for a utility script.