While this theme has everything that can be offered within this price, may be you should add an addon (free or premium) which enables any or all of followings:
1. Checkout field addition/removal
2. Dropdown/List/Select/Checkbox fields in checkout
3. Conditional Price on Dropdown/list/select/checkbox selection eg. I select Product A with price $50, now there is a dropdown selection a,b,c. if a is selected then $5 will add up on $50, for b $10 will be added to $50 making it $60. Something like this.
When you purchase a copy of CONJ, you’re getting the highest quality WordPress theme for your WooCommerce powered store and gain peace of mind by knowing that your store’s performance and flexibility is as important to us as it is to you.