AbleCommerce Shopping Cart Software

I'm trying out a demo installation. My demo store is: http://ac7.ablecommerce.com/700066789332

I've been trying out the checkout process with multiple destinations. For now, it seems like I would have to customize the checkout flow somewhat. Here is what I tried:

• Registered as a new user.
  Added several items to my cart.
  Clicked Checkout Now
  Clicked on Multiple Destinations
  Entered Billing Address, Shipping Address 1, Shipping Address 2
  Clicked on Cart to look at my order again.
  Clicked Checkout Now again.
  Clicked on Continue.

When I did that, it took the default Ship to my Billing Address option and apparently lost track of the shipping addresses I had entered. I can click multiple destinations again and just pick them since I've saved them to my address book but it seems annoying to do so.

Is it possible to customize the initial checkout page so it doesn't suffer from this problem? Would that be very complex to change? Or are there configuration options I haven't set?

Thank you.