I'm DMing a 5e campaign, and one of the players is a ranger (currently level 1) who wants to be able to shoot two arrows at once. I said he could do so, but at disadvantage for both arrows, which I just homebrewed on the spot.
At level 4, when they get a feat, I'm thinking about adding an extra option to the sharpshooter feat: the player can choose to take of -5 to hit for +10 damage (as per normal) or they can choose to take -5 to hit, make one attack roll and hit two enemies that are within 5 feet of each other.
(To reiterate, this adds a fourth benefit to the feat; it doesn't replace the third. Both options would be available to the player with this modification. The player can choose either option but has access to both at all times.)
This may be a tad overpowered, but I'm thinking maybe add that you must have the Archery Fighting Style for this option and you must have at least 20 feet between you and the targets.
From a balance perspective, is this a reasonable addition? Does it require more restrictions?