Twisted three-generation compactification

We show that the three-generation compactification paradigm is capable of a combination of phenomenoligically interesting twists. One stems from the existence of an alternative way to pass form nine to three generations, the second from some recent results on the E6 single sector, the third one from a twofold (2.0)-deformation and the fourth one amounts to generating fine detail in the Yukawa couplings and fermion masses. Most of these effects are related to the existence of an R-symmetry, which is also used to prove an interesting selection rule. (orig.)