Noodelsz, this is not the right place to ask for a 10 second panic on a map. If you want to do the 10 second panic on Labyrinth, then ask an op when you are getting ready to start the round. :)
Any who... to the main point. If there was a command that would initiate a 10 second panic, then it would be easier for Ops to take part in it as well, for it would save them the time of summoning and then un-reffing. As for the idea of allowing players to possibly change their vote, it might be confusing to new players and even harder to explain. The round doesn't last that long anyway so, in my opinion, I see it somewhat pointless to make a huge ordeal about whether they voted truthfully or not. :)