we've never asked, but have been behind people in the check-in line that were asking if they could. In every instance, those asking were told "no, sorry, we are not set up for take-out service."
Saw that happen at Le Cellier (on several occasions) as well as Kona Cafe at The Polynesian and Turf Club at Saratoga Springs. People were directed to the closest counter service locations. Now will say every time we saw that happen, the places were very, very busy, with long lines at the check-in desk.
Maybe if you happen to hit a "down" time they would be more accomodating. I would guess that if you have to wait in a long line before you even get to ask your question, the answer will be no!