Yes, WAB has the "Group Filter" widget, that is its name. We only have a few WAB apps left, but I use the Group Filter widget for this kind of thing, like when I have half a dozen layers and I want to filter them all based on their "created_date" or something.
And yes, I was thinking that if there weren't an EB / WAB specific function needed, like editing or something, a Dashboard has a lot of nice capabilities for interacting with data. Having a button bar at the top/side of the screen with the different agencies would be very very simple to set up.
- Josh Carlson
Kendall County GIS