You can set the number of frames per second that results in the desired kpps by calculating it from the number of points in the test pattern frame. For the standard ILDA test pattern I think this is 1191. This means for 12 kpps you want 12000/1191 = 10.0755 FPS.
I realize this is a pretty unintuitive way of doing this, but LSG was mostly designed to work with its own optimization that uses a fixed framerate, rather than variable framerates like many special ILDA files like the test pattern expect. So the feature that plays these files was hastily patched on later. In the future I plan to rework this to make it easier to play such files with intuitive settings and good results.