I've done this, too. To be honest, a red warning bar isn't terribly helpful in astro software, which is often used in "nightvision" mode, where most aspects of the display are reduced to red anyway.
I recently commented that I would prefer that any exposures longer than 60 seconds be automatically saved regardless. I'd much rather have to delete image files after a session than discover an entire night was wasted, particularly when clear nights are so rare.