Martin said
Frequently requested, but rather difficult to implement. No plans of adding this feature anytime soon, I'm afraid.
So, this was the state of play at post #2 in January 2012. Four years on (enough time to organise another Olympics / World Cup etc, and - what - about half the time it took NASA to develop the Apollo programme and get Armstrong & Aldrin on the moon!) are there any developments? It seems such a basic element and I'm amazed it's missing.