The following missions would be an awesome addition to STO.
The first would involve tracking the V'Ger Probe through sector space where after you complete numerous ground missions you would then find yourself inside of V'Ger to negotiate the terms of Earth safety.
The second mission would involve going back in time to find humpbacked people sir? in order to return them to the future in order to save the Earth from the Whale Probe.
Doctor gave me a pill and I got a new kidney.....Doctor gave me a pill and I got a new kidney....are you certain....
The third scenario would going back in time where you first have to steal the Enterprise and then rescue Spock from Genesis.