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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WP Speed of Light
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Admin Bar Color
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Custom Sidebars – Dynamic Sidebar Classic Widget Area Manager
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Dilli Email Validator
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WP Mobile Menu – The Mobile-Friendly Responsive Menu
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Remove Image Links
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LTR RTL Admin content
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Lite LMS Progress Tracker by LifterLMS – Simple Course, Membership Site and Content Progress Tracking for WordPress
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rtSocial
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WP eBay Product Feeds
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Fullwidth Templates for Any Theme & Page Builder
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WP Widget in Navigation
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The Events Calendar Shortcode & Block
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NS Smooth scroll back to top
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Min Max Control – Min Max Quantity & Step Control for WooCommerce
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WP w3all phpBB
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Surbma | Smooth Scroll
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ShopMagic – email automation
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Human Presence – Stop Form Spam Without ReCaptcha
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Custom Buttons for WooCommerce – Add To Cart Button for Product Types