Cart revisions

-- HikaShop version -- : 2.3.2
-- Joomla version -- : 3.3.3
-- PHP version -- : 5.3.28
-- Browser(s) name and version -- : Chrome 36.0.1985

Three questions pls:

1. I grant free shipping to all orders > $100 and have configured this correctly in the back end. However, if the customers makes changes when they review their cart prior to payment, but after the free shipping is selected (this is my preferred workflow), this can bring the order below $100 but the free shipping is not revised. How can I ensure that any adjustment to order value below the threshold is picked up, and shipping cost re-assessed?

2. I have the hikashop menu item "Cart display". If a user is not registered or logged in, they can view this cart so long as it has items in it. My issue is that when the cart is empty, the message reads "please log in first". Why does this happen, there should be no need to log-in first to view the cart.

3. Related to the cart display above, when the user deletes or modifies an item, they are sent directly to the checkout. I would prefer they are returned to the shopping pages. How can I amend that pls.

Thanks!