hover just means you don't fall when knocked prone. Theres no minimum forward speed in 5e anymoreThe nature of that type of flight is limiting enough without inventing anything else. Normal bird flight isn't as perfect as the fly spell. Creatures like aarakocra and harpies have to maintain a minimum flight speed to stay in the air. Check the MM and you will see how few flying creatures get the hover feature. Think airplane and not helicopter.