In reply to ROSP:
It depends a bit on the situation. If the second half rope is no longer needed, or at least not for some time, I'd probably put it away. If normal pitching might resume shortly you can coil both together and move together with them both still in use. As someone said, a bit bulky but quicker than putting a rope away and taking it out again. However, when the rock is really sharp ( had this in New Zealand ) I've used two ropes when moving together and wished I had two thick singles rather than two half ropes.
Sometimes I'll climb with a triple rated and a half rope, putting the half rope away when no longer needed.