Interesting and valid requirement.
According to my knowledge, it is not possible to add that kind of functionality to a dashboard.
I'll search a little bit more to see if there is a solution for that.
Thanks Allan, very useful information. I'll have to play around with it.
Controlling the Urban Mapping data layers (Tableau's native background map supplier) is only available to Desktop users not Reader users. I'm not certain it the controls are available on Server or not.
I'd be very interested in seeing the output visualization