For the F3, there's the MD-4 which has only the S and C choices; the F4 has Ch and Cl, as you probably already know.
I shoot motorsports on the Cl setting. With Ch, I can't pan and track accurately. The trick is to practice, as mentioned above, and anticipate when things will happen. After all, sports used to be shot with 4x5 Speed Graphics!
Ultimate solution is to have a pretty assistant that loads film into second camera for you. The F4s is a total bargain today - inexpensive to get a second one.