The Share Widget in WAB is aweeesssommmmeeee. It just works. Love it. Love love love it.
it would be neat to have the Share widget make whatever layer it's drilling to, visible also.
For example, Neighborhoods. ArcGIS Web Application It's turned off. It would be nice (at least as programmer's option) for it to turn the layer on as visible. (while respecting draw scales that were set for the service of course)
I could hack it to do this perhaps but it seems like a good idea for an out-of the box feature addition.