Allow selecting multiple configurations

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/allow-selecting-multiple-configurations/
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I have configurations for carrying a kayak, two kayaks, bicycles on the rear, bicycles on the roof, Cross parts only on the roof, and lastly nothing on the roof at all. Ideally, I should be able to select multiple configurations, instead of having to create configurations for every possible combination of toys I might be transporting.