WP3.1 multisite "mu-plugin" that allows you to add a user to all sites or no sites. Just drop in mu-plugins.
More Plugins
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bbPress Unread Posts v2
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Simple Staff List
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Disable WP Registration Page Spam
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Resizable Sidebar for the Gutenberg Block Editor
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WP User Stylesheet Switcher
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Vectr – Embedded Graphics Editor
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WPvivid Backup for MainWP
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BlackBox Debug Bar
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Easy Notification Bar
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Faktur Pro for WooCommerce
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Google Web Fonts Customizer (GWFC)
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ManageWP Worker
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Custom Sender for Email Before Download
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Dynamic Pricing With Discount Rules for WooCommerce
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Better Font Awesome
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Preserve Editor Scroll Position
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Sublanguage
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Crop-Thumbnails
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Responsive Videos by Angie Makes
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Visual Composer Website Builder