When creating a launch, you are required to enter a due date. Please add the ability to put a launch in the parking lot from that creation window, rather than having to go an set it as a separate step.
You can create a new release (Launch in your terminology) directly as a parking lot using the "Add Column" button within the parking lot section of the Features -> Board page. You might need to scroll the parking lot section to the right to see the button.
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