--enable-final is supported by the configure script, but the kdeenablefinal use flag to activate it is not used by this ebuild.
Created attachment 88009 [details, diff] koffice-1.5.1-r1.ebuild.patch
Still need to test locally, will commit soon....
Charlie: Are you working on it? Personally I don't think it's worth it. Even for the KDE ebuilds exposing the flag resulted in at least as much confusion, stalling builds and bug resports, as user benefited. I'd close WONTFIX...
Can be re-opened at any time, of course, but for now WONTFIX seems appropriate.