Hi Steven
I've been doing quite a lot of dynamic analysis, using creo, and am happy with what it does.
It should be able to do the things you ask, however: it is an uinlikely dynamics problem.
The time response is a response to a preferably dynamic excitation. just spinning a rotor (assuming it is mass-balanced) is not a dynamic event in that sense. You could easily get very good results using centrifugal load (a static analysis). I use the dynamic analysis to determine critical frequency (a modal analysis).
one could investigate the response of the rotor to a spinning up, or a sudden stop. But as said, rotating it for a minute is a static load. A good time response (meaning you use enough modes) should resemble the results for a centrifugal load-static.
Does this help?
Kind regards
Erik