I wire the smoke unit and light to the TMCC package so the smoke and light are controlled by the remote. If I'm going to the trouble of installing the other stuff, I like to give them as much as possible.
Bob brings up an important point, some motors are not suitable for cruise, so you'd want to check that before you specify cruise. I install cruise whenever it's possible. I've run across several locomotives that have incompatible motors, those don't get cruise.