Speaking of which, I think there should be an event chain causing TUR to declare war if BYZ expands at all (since BYZ will have at least 2 provinces, this will not lead directly to annexation, only to the new province(s) being stripped away). By this I mean it would have a countrysize = 2 trigger, with the possible exceptions of Byzantine expansion to incorporate Morea and/or Trebizond. Byzantium may be being given opportunities it never had, but that doesn't mean that the OE in 1419 would tolerate any significant expansion, nor does it mean that the early years should not be extremely nerve-wracking and painful

Besides, I like the idea of playing Byzantium and knowing that if I expand at all it means an instant showdown with the Turks.