Some of us are hoping that a few of the different races within the Klingon Empire faction (Gorn and Orions etc) will have some of their own ship designs to use in place of Klingon ships. I've never been happy about permanent non-Klingons officers on ships in the KDF. It's just un-Klingon.
"We are Klingons. We don't embrace other cultures, we conquer them."
Martok (You Are Cordially Invited... - DS9)
You are right about that however, Klingons also respect power, if a non Klingon proves himself worthy he would be granted almost all the same power/priviledges a klingon would (a couple example in TNG)