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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Fuse Social Floating Sidebar
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User Tour Guide
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ELEX WooCommerce Product Price Custom Text (Before & After Text) and Discount
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Extra Product Sorting Options for WooCommerce
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Simple Link List Widget
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Timeline Block For Gutenberg
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Sublanguage
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Responsive Videos by Angie Makes
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Variation Swatches for WooCommerce – Color, Image & Size Swatches
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Random Banner
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Custom Field Taxonomies
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WP EasyScroll Posts
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Musopress Discography
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Tag, Category, and Taxonomy Manager – Autotagger Automatically Add Terms
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Supaz Easy Background – Easy way to add parallax image or video background
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Comment Approved
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Quotes llama
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Gutena Forms – Contact Form, Survey Form, Feedback Form, Booking Form, and Custom Form Builder
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Simple Giveaways – Grow your business, email lists and traffic with contests
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Simple Cookie Control