So when your talking about backboarding you would still use the headblocks and pad the voids if c-spine couldn't be cleared? Also I've read that the traction splint shouldn't be used on hip fx (proximal femur fx) or pelvic fx. How can I tell a midshaft femur from a hip fx? I assume a midshaft would shorten more so then a proximal.
Backboards are not spinal immobilization devices, they're extrication devices. You can choose to add head blocks, tape, towel rolls, a C-collar, spider straps, 9 foot straps, perhaps even a head bed...but it still has nothing to do with immobilization.
Once you separate your terminology to remove this confusion, the answer becomes obvious.
Rolling your hip Fx patient is going to be awful, sliding your hip Fx patient is going to be awful. Whatever you choose, you must limit both of these actions.
If you had some indication for spinal motion restriction, you should continue through whatever your procedures are for SMR.
If you have no indication for spinal motion restriction, you should continue through whatever your procedures are for moving a patient with a hip Fx.
You probably have a device which can satisfy both the Brothers Grimm and your patient's hip Fx: the scoop stretcher!