Is there a way a specific Sun Management Center (Sun MC) module in a certain host can be turned on and off dynamically by some script/program/command?
Yes, the PrimeAlert Module Scheduler module is designed to do exactly this. It works in a fashion similar to the ScriptRunner module. It executes a specified script and monitors the output of that script. You specify a pattern, when that pattern is matched, the specified module will be disabled. This is useful for turning off modules on holidays so that you do not receive false alarms or events. It also helps to keep the event database cleaner.