hinge rotators

Use vizzy program to bounce (e.g. 1,5,1,5,ect.) a slider,set the rotator to said slider

Not sure what you mean, but if you want them moving freely you can slide its speed property down to zero. It will say floppy.

Use motors

What do you mean? Because there are motors that act as normal motors and then there is also a setting on hinge part that makes it not have any controller behind it