Is it possible in the .NET Moles framework to use the Fallthrough Behavior in Stub Types as we do with Mole Types?
I can override the default behavior of a Mole instance
It is explained in the manual at "Partial Stubs". What you want is CallBase, which is a property of Stubs of Moles :
var stub = new SMyInstance() {CallBase = true};
or
stub.CallBase = true;
Hope this help.