There's a MUX level, that creates a standard component that selects between two inputs. But I think it would be nice if there was a DEMUX standard component, one that given an input and an 
/ 
to a directional pin splits an input into either output port 1 or output port 2. Sure, it's trivial to make these components yourself, but having them be official would be nice.
#A DEMUX level would be nice.
inland scarab
steady gust
They do have a 1-2, 2-4, and 3-8 decoders but yes, having an actual demux that would take in an N-Bit (4,8,16,32,64) bus line to distribute it between 2,4,8,16 lines with a 1,2,3,4 bit input select (address) line would be great.
potent sedge
In the meantime, it's pretty simple to make as a CC. Just a decoder and some switches