A hunter bow already has special properties.
additionally, 1d6 massive criticals is not a tremendously important property. I remember this being discussed a long time ago the conclusion being that compound hunter bow recipes were not going to be added.
G-452 (enzo) designed the hunter bows of different woods, previously there were only oak hunter bows. That is probably what you are thinking of.
I don't think Rangers are on the list to get MORE special class restricted recipes or CNR items. If more class specific recipes are to be added, they will be given to other classes first before coming back to give rangers any more. Most classes don't even have 1 special class recipe.