Add checkbox as a custom field type
End users are quite used to check boxes for yes and no options. In fact they are ubiquitous. The same goes for Boolean variables. There are everywhere in the IT development world except in Wild Apricot. It's an undeniable waste of time for every new developer to have to figure out why they aren't there and find a workaround, and at the least an eye roll from end users who have to react to the strangeness of having to process a radio button in place of a checkbox, not to mention the extra (wasted) space it takes to implement it. It was a bad decision. Consider this a feature request for proper Boolean variables.