1. Whether or not you are planning to move is irrelevant. By making extra payments, you are reducing the length of time of your mortgage payments and your long term interest expense. If you sell, your extra payments go toward your downpayment on another place (assuming you "sell to buy") or get added to your check at closing. This is also a "lower risk" investment (forgoing money now to shorten future payments and interest).
2. Look up your rules and regulations. If there's nothing in there about Scooters, then ignore the nitwits complaining about yours. BTW, Scooters are "urban hipster" material (don't know if you're in an urban/liberal area...).