I found the solution for bug #1. shopping cart shows a sub-total of $0.00
on includes>classes>shopping_cart.php
locate
PHP Code:
// products price
$product_query = "select products_id, products_price, products_tax_class_id, products_weight,
and replace for
PHP Code:
// products price
$product_query = "select products_id, products_price, products_price_w, products_tax_class_id, products_weight,
products_price_w is missing from 1.7
The solution for the free shipping problem in dual price is easily solved with Free Shipping Options assuming you request a minimum order amount for wholesale customers. Go to Modules>Shipping modules>Free shipping options and enter values for Total >= and Total <=
These below are the settings for one of my stores, so I offer free shipping for orders above $35 but I charge shipping for orders above $200. Wholesale and regular clients won't receive free shipping above $200. I use the USPS shipping module with these settings and it works like a charm 
Total >=
Free Shipping when Total >=
35
Total <=
Free Shipping when Total <=
200
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