MODIFICATION TO OPEN CART REQUIRED

hELLO

I NEED TWO BASIC CHANGES TO OPEN CART

1.users can add to cart from products in a list view without leaving product area-so basically multiple products can be added to cart without having to go to shopping cart area

2.group discount must be a fixed price rather than a percentage

will the first feature create a situation where future upgrades to open cart on my site will be a problem?

contact me if you have suggestions

thanks

1. I think it's already in opencart 1.4.8
2. http://theqdomain.com/ocstore/opencart_ ... group_disc