I don't have PAC Display open right now, but some of the gadgets have a 'hysteresis' setting. This would help the re-draw on every value issue I suspect. (Just not sure if the rotate object has that as an option).
[Edit]. More thoughts on this..... Firstly, your right, its not broken, that is the way it is supposed to work. If the value changes, the graphics needs to redraw the object, it cant tell what sort of object is connected to it, so it can't know how its going to look by doing the redraw, so it just does it..... If you are not happy with the look then you have some options;
* Set analog filter weight. If the value is coming from an analog point and will not impact on the process, then by filtering the analog signal, it will calm down the jittery redraws.
* Move the value to another value and use the Truncate command or Modulo command to remove some (all) of the decimal places. I often did this at the hospital, use the real value for the process and then had another cleaned up value for the PAC Display operators.