As the title says, the check box to always return a refurbished shuttle does not work.
Also the text box to set refurbish chance is limited to between 0 and 1 which means in game you are limited to between 0% and 10% chance to get a shuttle back, which kinda makes the whole shuttle reuse mechanic a bit silly.
Okay the the refurbish shuttle overwrite checkbox does work it is just name inversely to what it actually does. So that you need to uncheck it if you always want a shuttle to be returned.