What OP forgot to mention, only more variety to the already existing options will the devs do. Not new options, because that would increase the amount of info that have to be send between servers and clients.
example: instead of "character have face 2" it would be "character have face 2 with horn 4 and beard 5", which is a big No for the devs. Now if they make a face 5 that have horn 4 and beard 5 then that will work.
More faces? yes
More hairstyles? yes
extra option for horns seperated from face? no
mixing 2 hairstyles? no
more sliders? no
Maybe as face paint ^^
