I don't know Donsig - I think any agreement on dealing with BABE's abandoned lands could be considered an addition to the ruleset, and just as binding as the rules against reloading, for example.
As for the 11 tile Islands – I think they should certainly remain up-for grabs. Realistically, that just cuts GONG out of having one… which is fine with me. They probably don't care that much anyway, in their race to cultural domination.
Trying to place limits on what can be done with the 11tile islands would severely limit the strategic interests of this game.