Here is what I need:
- An insurance value calculated as x% of an item customer send us. A service is provided on the item (this is what we sell, a service). The price of our service has nothing to do with the value of the item. However we need the appropriate amount of insurance for the item people send us.
- The customer must enter in a field the value of the item. This value should go in a database that we can retrieve.
- The insurance amount is x% * item value. x is the insurance rate that must be customizable.
- The insurance amount is added to the total of the order.

I checked the optional shipping module but it does NOT seem appropriate to us as we need an insurance customize for the item customers send to us, not to the service amount we sell.

Any other module? What would you recommend?