Mind you, we don't know for sure that it can't be used both ways. There are some Klingon verbs that do that.
It is fine to casually ask him a question or two, but it is inappropriate to inundate him with questions or pull out a long list of questions or do it in a way that demands a response. Also, frequently he will be unable to answer and would have to refer back to Maltz (i.e. his notes). In particular, he seldom remembers whether he has used a word transitively or internationally and often will answer that Klingon grammarians don't really recognize that distinction even though it is clear that some words can take an object and some words can't.