I have a field with multiple options and I want to allow it to have only one option selected at the same time but user can hold CTRL key and
I am coming here after searching google and change thing at my-end.
So I just change this sample and it will work with jquery at run-time.
$('select[name*="homepage_select"]').removeAttr('multiple')
http://jsfiddle.net/ajayendra2707/ejkxgy1p/5/