I have added 3 commands to the simulator interface:
PAUSE : pause/resume simulation
RESET: reset (start again) simulation
SAVE: save current state of the simulation

Please review the commit ( 7865 ), I wanted this to be in before the release.

Gazebo already had these commands, I have added the connection to Player in Gazebo also (7866).

Jordi Polo Carres
NLP laboratory - NAIST