Smart Coupons for WooCommerce

At the moment when you do a buy x, get x free coupon it works great. BUT the function isn’t smart enough. … if I do buy 3 (£20 each), get 1 free and the customer add 3 items to the cart, they’re charge £60. If the customer add 4 to the cart they’re charged £80 (i.e. for all 4). There should be a setting to autocalculate how many free items are due … e.g.
Buy 3, get 1 free
Buy 4 ,get 1 free
Buy 5, get 1 free
Buy 6, get 2 free and so on …

I think we’ll anticipate the use case for when someone adds 4 to the cart by doing a 25% discount. but we can’t work around for everyone scenario.