What I do, is if the querent is okay with telling me what their question is, I will ask the cards the question whilst shuffling for them. However, then I give the cards to the querent, ask them to think about the question, and cut the pack thrice with their left hand, kinda like shuffling I suppose. Then, they pass the deck back to me, and I deal. This way both our energies go into the question, deck, and reading, and the querent feels involved.
If they don't want me to know what they are asking (This usually only happens with my close friends who are asking questions about a particular person they are interested in) then I let them shuffle, after I have. Then they cut with the left hand, and the reading proceeds from there.
I guess its all down to what you feel comfortable with! But it's certainly interesting to know what other readers do.
Kiama