Engine Animations: Are you getting this?

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So is the soluution something that PMDG may be able to come up with. I know other developers that use the N2 rotation speed as the N1 to achieve smoother [but slower] animations,

Solution is a bit subjective because each user has different expectations as to what they perceive as normal, generally due to ones awareness of the effect.  As demonstrated above, some see the effect as perfectly normal.   There are other options though, for example, if one animates a rotating component "x degrees per single animation frame", for example, if N1 is rotating at some RPM....and a single animation frame is say 1/50th of a second, then in this case, the disc would rotate y degrees in that time. This can be a problem because it causes variable effects with varying FPS values, which we all know is super common in sim. The first part of this approach is not to animate the rotating component every animation loop but rather animate it at a fixed frequency like a real camera does, say every 1/24th of a second. The slower the frequency chosen, the more consistent it will be for more users and the final effect is then independent of frame rates. Now this technique alone does not remove the effect, it would still be present but it would make it look one step closer to normal because the 'pattern' of the effect would be in line with what our brains are used to. The second part to this process, but more subjective to end users, is to optionally blur the effect with increasing rotational speed because as things spin faster, they get more blurry to a video camera. Computers, technically, take infinitely fast "pictures" each frame and can freeze any motion whereas a real camera (generally) blurs fast moving objects. By combining the two techniques, you can get something that looks a bit more normal; however, it still comes down to user preference IMO as to what is normal, usually with regards to how much blur is added.   Here's an example of the above approach though with quite a bit of blur, a bit more than I prefer on the spiral, but again, it is subjective.

https://dl.dropbox.com/u/955680/disc.mp4