Membership Levels filtering... convert to multi-choice

Would it be possible, i.e. simple (possibly repeating) code changes, to convert all instances of the default "single choice" Membership Levels dropdown list to allow more than one choice?  By Membership Levels dropdown list, I'm referring whenever it's used as a filter to limit access (see attached image).

... would this also require a change to the database?

TIA

membership-levels.jpg · 10.8K · 89 views
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Quote · 24 Mar 2012
 
 
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