The (kinda heavy) clicking while rolling the bike backward is normal. It's the clutch dogs in the motor drive.
On that non-zero start, they make a good point from a safety aspect. It's VERY easy to do something that will cause the bike to surge ahead unexpectedly while climbing aboard. Been there a couple of times right after receiving mine! That'll put some excitement into your life! What I learned though, is to make darn sure the bike is turned off, or have a handful of brake when boarding.
I would find and change that "non-zero start" setting. It totally defeats my primary reason for having a throttle. Mine is used to get the bike rolling, and is rarely used from there. Holler if you need a hand. I'll dive in and see if I can find it if you can't.
And last, 2 things really. First, rider weight can have a BIG impact on range. My wife is able to get nearly twice the range I was able to get on my old bike - but I weigh more than twice what she weighs easily. Also, speaking for myself, it took me quite a few miles to teach myself how to ride the bike efficiently. Not talking a hundred miles either. I'll bet I was a good 400 miles on my first bike, which was a cadence sensing hub drive. I'm at about 250 miles with the new Ultra equipped bike, and STILL getting used to it.... -Al