We were there last month, and ate dinner at BOG twice. Both times we requested a specific room when we checked in. Both times, they picked up a phone to call someone and see how long the wait would be. The first time, they told us 45 minutes. It took 10. The second time, they said 25 and it was less than 10. I wonder if it's just a way to discourage people from asking. I definitely wouldn't ask at the door, though, as they've already assigned you by that point.
As I was waiting both days, I saw them pick up the phone and call whenever someone made a request, so I don't know if this is something new or if it was just something they were trying out.