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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SchedulePress – Auto Post & Publish, Auto Social Share, Schedule Posts with Editorial Calendar & Missed Schedule Post Publisher
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FlatPM – Ad Manager, AdSense and Custom Code
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Automatically Hierarchic Categories in Menu
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Inline Spoilers
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Debug
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WP Admin Category Search
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Flexible Frontend Login
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Flipbox – Awesome Flip Boxes & Image Overlay for WordPress
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Charts Blocks for Gutenberg
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FormLift for Keap (Legacy) Web Forms
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Contact Form 7 Signature Addon
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ProfileGrid – User Profiles, Groups and Communities
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Booking for Appointments and Events Calendar – Amelia
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Menu Cart for WooCommerce
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Educare – Students & Result Management System
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Quoty
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Ditty – Responsive News Tickers, Sliders, and Lists
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Filter Gallery
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WP Posts Carousel
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WP Webhooks – Automate repetitive tasks by creating powerful automation workflows directly within WordPress