Well, I very often spectate matches of another people (actually I spend more time watching than playing, 'cause when I'm playing, I'm losing all the time :D), so, I'd very appreciate a possibility to switch sides as a spectator, so I could watch the board from black's point of view. It certainly isn't necessary, but I think that at least for a begginer like me, this option could help me analyze the position on the board... So, that's it :)