It is possible; currently either the SF or the Imported Griffins already breed with eggs, depending on your [OffspringSForImported] setting... I'll take it into consideration!

[OffspringSForImported] needs to be set to what to enable egg breeding? Default says =SF and right now we dont have eggs.

Btw, they are not imported. We have SF Griffins on the new map which has no native Griffins.

Ok, I understand the confusion: I chose to have the SF Griffin give live birth by default. The Imported Griffins lay eggs by default but they then get the SF type babies, so that you can continue the breeding lines with the imported flyers with only one intermediary step...

If you set it to 'Imported' it's the other way around: The imported Griffins give live birth and the SF Griffins lay eggs, now both yielding 'Imported' type offspring. This way, should you ever want to remove the mod, you can continue your breeding lines with, again, only one intermediary step... It's confusing for the Griffins, I know. All the other flyers have the same option but of course they all lay eggs for both the types...