It's okay to add the subject as a pronoun for emphasis. From TKD:
{jIlujpu' jIH'e'} "I was ME who failed" (not someone else)

So you might say {pa'Daq ghaHtaH ghaH'e'} to say that "it's him who is
in the room, (not they)".

No, this doesn't work. jIlujpu' jIH'e' is a basic sentence; pa'Daq ghaHtaH is a copula. The ghaHtaH in the copula is not a verb; it's the subject. And when you have a sentence like pa'Daq ghaHtaH HoD'e' The captain is in the room, the -'e' there marks topic (what the sentence is about), not focus (making the word exclusive). That is to say, the HoD'e' in my sentence doesn't mean the captain (not someone else); it means as for the captain.

If any Klingons say things like pa'Daq ghaHtaH ghaH'e', it is completely unattested and does not follow any rules we have been given.

-- 
SuStel
http://trimboli.name