How much can ball handler use his arm?

[Travelling Man]

Play On or "call a foul"--this is always a dilemma. How do we percieve what the "intent" was in sticking out their arm (i.e., chicken winging it)?
If advantage is created, then whistile it is what I do.
In cases where the offensive dribbler is using it to ward off a pesky defeneder who is actually D'ing him/her up pretty good---then I'll call that offensive foul. I don't err toward "just giving" offensive players rights of way.