I crank when I'm alone at the field. I sometimes am the only one out there for long periods. I also crank on the grass. The big thing is to always think ahead when cranking in any situation. It is like a checklist. Radio safe and at or near idle. Get in a safe position for starting with a mind for any problems that may happen. Always have a firm grip even when the model is restrained by devices. Don't trust them. Always expect the worst and be prepared. I've had full throttle starts but was ready for them. They aren't fun, but it happens and you should expect it every time you pick up the starter or flip the prop. I always do the same things. I don't vary my procedure. Distraction is dangerous.