I'm developing two techniques (Method 1 and Method 2) to achieve Motion Blur (Whip-Pan) transitions in Shotcut. Method 1 is done entirely with Shotcut, and results in a short panning distance. Method 2 uses Shotcut and GIMP, and achieves a wider panning distance. The speed or rate of transition (both Methods 1 and 2) can be varied to suit the context of the footage, varying from very fast to a slower transition.
This demo features a mixture of Method 1 and Method 2 transitions. I'm working on a Youtube tutorial which explains how it's done in easy stages, so watch this space!! Best wishes, JonRay.