As far as I remember, Autofire for ground combat for both factions was removed either shorty before or shortly after release. They (Cryptic) has made no statement of whether or not they are going to re-implement it, but I am sure this is far from the first time someone has asked this very same question.
Ground auto-fire works on Fed toons after the big patch, it's still disabled for Klingon side though.
You expected something different? Cryptic will give Klingons this ability when they give Klingons off-duty clothes, Joined Trill and female Gorns. It's all coming "soon" in a big Klingon faction update.