Note: Creatures tamed before adding your desired ini option will still be able to breed. So i advise that you edit it as soon as the mod is added to your server/world.

In the newest update the first wave of ini settings has been added. The text should be added to your gameusersettings file on the server or the one in your game folder if you are running singleplayer.
The PreventMating ones are quite simple, true means that you don't want them to be able to mate and false means yes, you want them to mate. All these settings are enabled by default so you only need to include them if you want to stop one from breeding.

[BreedableBundle]
AchatinaPreventMating=True
AberrantAchatinaPreventMating=True
ArthroPreventMating=True
AberrantArthroPreventMating=True
AstroPreventMating=True
BasiliskPreventMating=True
BoaPreventMating=True
AberrantBoaPreventMating=True
DungBeetlePreventMating=True
AberrantDungBeetlePreventMating=True
SERockGolemPreventMating=True
VALChalkGolemPreventMating=True
VALIceGolemPreventMating=True
GENXGolemPreventMating=True
GriffinPreventMating=True
KarkinosPreventMating=True
MantisPreventMating=True
LymantriaPreventMating=True
OnycPreventMating=True
PhoenixPreventMating=True
RockDrakePreventMating=True
ScorpionPreventMating=True
AberrantScorpionPreventMating=True
IceWyvernPreventMating=True
FireWyvernPreventMating=True
LightningWyvernPreventMating=True
PoisonWyvernPreventMating=True

That is currently all the ini options that you can use for the mod at the current time, if there are any you'd like to see added please leave a comment.