I have in the past. Sometimes I would correct myself and say something "duh, no wonder that didn't work" or "damn where am i now?" when I didn't end up where I expected. I don't do much ld anymore unless I'm stuck with a repetitive dream or a repetitive type of situation, then I might be inclined to use ld to work through something.
As far as asking the unconscious, I think it's healthy for the most part. What kind of answers are you getting and are they helpful?