A ninjutsu focus is definitely viable, and has been discussed recently in other threads on this board, so I'll let you look through those. As for throwing, I personally don't see it being that useful compared to ninjutsu or melee, not to mention the lack of a weaponskill for it. Admittedly, I don't use throwing for anything but pulling, so perhaps there is some potential there that I am missing, but I personally just don't see it being an effective option when compared to ninjutsu or melee.
Formerly of Lakshmi, now in Asura
FFXIV: Kagu Tsuchi