I'm not sure why it's confusing to you. It's most likely exactly what your SOP is in your 76. Do you offset the centerline when in position?
The danger is getting hit from behind by a landing aircraft. It's happened twice that I can think of off the top of my head. (EMB @ LAX and King Air IN ATL)
Actually what I meant to imply is ANY forward looking lights have the potential to confuse a down field crosser (strobes in position certainly serve to bother those awaiting their turn). The offset idea really does make one more visible (and yes I do it in the 767 and smaller airplanes). Frankly, sometimes I neglect to illuminate forward looking lights when cleared for takeoff but I usually remember and if the industry practice was to leave them off until said clearance was received then I think downfield crossers who are trying to decipher signage, interpret instructions, contact the limo company or fbo, monitor the other guy AND watch for fellow aviators barreling down on them at 140K would be less distracted if the guy "holding" looked less like a guy "taking off".