What is the best policy on modifying an existing Kentico WebPart/Control?

We want to change the display of the shopping cart to allow a thumbnail of the product image. From what I can tell, I would need to modify the ShoppingCartContent control to display an image. This control is not a web part per se, but one of the controls that make up the shopping cart web part.

Is it better to:
1. Modify the existing Kentico control with the risk that our changes might get wiped out on a hotfix update.
2. Copy the control and modify it with the risk that the new control won’t receive updates that the original control would receive.

Or if there’s a better way to accomplish this?

Thanks,

Jim Garwacki