Definetley mind using the bars, i had the rac recover the zxr from a bike rally years ago cos the reg/rect burnt the wiring out. he ratcheted it down on the bars and off home we went.
Got home, did the repairs and riding into work the front end felt funny, so pulled over to the side and pulled/pushed on the bars, and the left bar securing bolt had sheared through. I was so lucky i had pulled over. I complained to the RAC about it, and how dnagerous it was, but they were not intrested.
I ended up having to have the broken stud welded out of the bar, and replaced the other side with high tensile bolts as well.
I have always used the headstock and rear pillion foot rest hangers with ratchet straps whenever moving bikes about, and have never lost one yet.