1. Yes. In your menu's hikashop options, you need to click on the associated module link in order to access the hikashop options of the products listing. You can directly them by going in the menu Display->Content modules and edit the module with the id 56. There, you have the option 'type of layout' that you can change to what you need.
2. These kind of restrictions on discounts are only possible with the commercial editions of HikaShop. You need to create a new coupon via the menu System->Discounts, set a minimum number of products of 3, a percentage value of 10 and activate the auto load in cart option.
3. It's possible as well but only in the Business edition and you will have to change a bit the code of a view as explained in the thread:
www.hikashop.com/en/support/forum/2-gene...-a-custom-field.html