Let use diferent themes installed for each user role actived.
You can set which theme will be use visible for « administrator » role while logged, or for « editor », or any other role created. Also, you can set which theme will be visible for rest of visitors, that´s rest of people that are not wp users, just visitors.
It´s very easy, just install it, go to Development Themes Options page, choose your roles/themes and save.
You can use this plugin for things like:
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Put your site under maintenance using some other alternative theme for your site, but let the administrator or any other user role be able to see and work a new theme, let´s say an update.
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You can test some new theme while rest of visitors still see the current one.
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In fact, you can show a theme for any user role that is actived, default ones, or any other role created by some other plugin. Let´s say one of those role managers available. I´ve tested, and works.
You can also turn Off the plugin, in order to use the actived theme for all users and visitors.