the location (and orientation) of the oil filter....
....come on man!
Yes! and like Glider said, make it upright.
Also wondering about a "smarter" ECM. A friend rides a Goldwing and is looking at changing the exhaust. Honda guy told him if he changes exhaust, onboard computer will automatically adjust and no need for a tuner or any tuning.
So, why can't Harley's ECM adjust?