What do you mean with
no matter how high I make the animate rotation input it still all appears to be the same speed
Do you mean it doesn't rotate faster or just that no motion blur appears?
Also, is it a 2D animation or 3D?
If it's just the motion blur:
In a 3D scene you have to activate "Motion Blur" under the third tab whose icon looks like an atom (don't know the actual name of that tab) in the Renderer3D (R3n) tool (see attachment)
If it's a 2D animation and your animating a mask you have to activate that in the same tab but in the masks tool (Rct, Elp, Ply, ...), or if your animating some image with a Transform (Xf) you have to activate "Motion Blur" in that Transform tool, again under the tab with an atom icon.