widget based on role

I would like to know this also

Yes I would like to know as well. Would make this one of the best and most handy plugin out there.

I found a plugin where you can hide widgets based on role when user is logged into the backend.
https://codecanyon.net/item/white-label-branding-for-wordpress/125617

You might want to check Extended Widget Options which has role based widget management. Thanks!