Just saw this post, sorry for delay.
On our recent image teleop_twist is in path below
Move demo never got the the point of being fully supported and thus documented.
move_demo allows moving forward or reverse using this command:
rosrun move_demo move.py forward 0.5
Distance is 0.5 here and is in meters where it is positive for forward, negative for reverse.
If reverse is about a half meter or more the Magni turns around before the reverse.
For just a rotate you many use this command
rosrun move_demo move.py rotate 45
the 45 is degrees where positive is to the left.
We are on the verge of a significant update to fiducial follow that will also allow messages to it to do basic forward or rotate and given a slightly downward facing camera mount not yet in production will allow following fiducials on the floor which is one mode that can be valuable for certain robotic applications.
I am not aware of how dnn_rotate operates, sorry.