Redo "Order" Creation Mechanisms (Incomplete Orders)

Currently we are getting tons of Incomplete Orders (3 on each add to cart or visit to the products page) due to specifics of current session handling mechanisms.

We need to redo these mechanisms in such way:

• Incomplete Order created only when user adds Product to a Cart
• 1 Incomplete Order per session/user

Once user completed the order and purchase the product - no new Incomplete Order created until user adds another Product to his Cart.