I know the "rush buy cost" can already be tweaked in the xml file, but is there a way to change the ship upgrade penalty, to change the downgrade cost ("upgrade" a ship to an inferior model (lower construction cost), and to change the decommission premium?

Also, is it possible to have a separate value for the improvement "rush buy cost" and the ship "rush buy cost"?

A way to adjust the ship upgrade penalty cost (percentage added to the difference between the actual ship cost and the new ship cost).
Ex: 0%, 5%, 10%, 15%, ..., 200%, etc.

A way to adjust the ship downgrade cost ("credits back" based on the difference between the actual ship cost and the new ship cost).
Ex: 0%, 5%, 10%, 15%, ..., 100%.

A way to adjust the ship decommission  premium ("credits back") (percentage based on the actual ship value (construction cost)).
Ex: 0%, 5%, 10%, 15%, ..., 100%.



***** If that is not possible, consider it as a request. *****