I would heavily advise against binding the Rollback feature to Scrollwheel. Many mice may not have a segmented inner wheel to reliably only activate the input once. But most importantly, touch screens and pads do not play nice with this input, if someone swipes with two fingers (the typical scroll control for these types) the input will keep repeating forever until a mouse is plugged in or the game is closed. Swiping in the opposite direction will also not fix this for those people, it will only either slow down the input speed, or just move it in the opposite direction to continue repeating.