A really common thing I'm asked to do is create a trail of floating objects. The obvious quick solution to this is to clone them onto a spline with a keyframed offset value and use mograph effectors to add variation.
The one thing I'm never happy with is the rotation generated by effectors. You basically have two options: Random mode - will rotate a bit one way, then change direction, then stop and flip the other way again; or noise/turbulence mode which is smoother but still changes direction too much.
A real floating object with angular momentum would rotate additively on all axis. I would love a way to make all my clones rotate continuously at varying speeds without having to use dynamics.
I'm not sure about what you want to achieve (also because the Random mode in the Random effector is not making the clones to rotate, just sets a random rotational position) :
1. if you want every clone to rotate at constant speed but each one with different speed you can use a Random effector with Weight Transform at 100% then a Time effector.
2. if you want the object to rotate at different speeds but always in the same direction ("additively") there's a useful little trick in Xpresso where you plug a Noise node to a user data, then plug the noise + the user data to the rotation input of the object