In my own experience running a plotship, I've had my latest battles come to be calculated in distances that were beneath the light second. I've had to use kilometers, and sensibilize my players with the relative speed which could be reached just with 0.3c alone and how o.6c, 0.8c and 1c travel speeds were already pretty fast.
Within that realm, it felt to me as if actual CDD FTL jumps were almost redundant, considering the distances that could be crossed at a high fraction of sublight speed, and the speed involved with the enemy maneuvering and using weaponry.
So, yes, I approve of giving better access to smaller units of speed. When things start seeming too high, they can get incomprehensible. It might help people grasp those values better, at any rate.
I'm actually glad this thread cropped up, because - to tell the truth - I never could quite measure supersonic speeds. I knew Mach 1 was the speed of sound, but I didn't know what Mach 2 and 3 were - they didn't seem to be equal to 2 or 3 times the speed of sound.
When I ran the Bowhordia mission, I ended up not being exactly sure how to deal with range, distance and such. I gave my dropship the speed of 4 kilometers per second. While trying to design around my Miharu-refit, I was thinking about aerial speed and I was uncomfortable choosing a value above 6 kps because it just... felt too fast.
I'm glad to now know that 1kps is really good and 2kps is probably the top-end of what a craft would go at in an atmospheric environment. It was a reference I lacked.
Thanks Jimmy.