Gas appliance fuel connector LENGTH

Q: A gas appliance fuel connector should NOT have an overall length exceeding _____ feet.
A: Answer is here

36" (3 feet) except for range and/or dryer connectors. . .

Easy answer if you know the rule about not interconnecting.

(But can you connect directly to CSST?)

Not in my town. . .

How about with a shutoff connected to both in between the two ?

My jurisdiction requires a rigid pipe connection to a shutoff - even if the rigid pipe is only 3" long.