I think the hair options for the Klingons at the moment is pretty poor. I personally would like to see more variants in length and straightness. At the moment Klingons seem only to be bald, bald pony tail and a few long curly variants.
What I would like to see is more hair types. I think this will be beneficial to all those who play the Klingon race.
The Worf Ponytail hairstyle will be really beneficial to those who play Federation Klingons since your Klingon would still have the honour of having a glorious mane but it will not hide his rank pips.
Now on the subject whether or not it should be purchased on the Cstore. I feel that I should leave this subject to better people. I would just like to state that I would most likely purchase it, if it were added to Cstore. Since I feel it would benefit my Characters.
"Klingons certainly do suffer from a lack of hair styles but the Federation side isn't that much better, you have better choice but not very many you will actually use. Really I don't see why they can't get a guy to spend a few hours copying things like hairstyles from Champions Online and putting them in to STO it isn't like that much work would be required and I doubt that doing such a thing would suddenly result in season 6 needing to go back to 2015 due to all of their resources being tied up adding a few more cosmetic pieces.
Alternatively they could always release cosmetic packs on the C-Store, make them cheap (say 50cp for 10 extra hairstyles or beards or whatever). At that sort of price I think it would represent value to those that wanted more and the additional money they would make would easily make it worth their while."