Add multi-select to Collector for ArcGIS dropdowns

Idea created by jgillham on Jun 7, 2013

    The Collector for ArcGIS app supports dropdowns through the use of domains, but currently only allows for a standard single-selection dropdown in the app. Some data collection efforts  require the user to choose multiple items to add to the record's field (as comma separated items within a single field). It would be very useful to allow for a way to allow either a multi-select dropdown or a checkbox list for certain data fields displayed in the Collector app.