Add multiselect option

[oliverschneider]

It would be really nice if one could select multiple values from the structure field. Example: Say you have more than one staff member responsible for the area. Perhaps you can pair it with the existing multiselect field https://github.com/distantnative/field-multiselect?

[calebgrove]

At some point (I don't have the time nor expertise right now), I have plans on adding support for a checkbox style of display which would allow for multiple selections to be made. See #1. Would this work for your scenario?

I had tried my hand at it a couple of months ago, but was unsuccessful in the limited time that I had on hand.