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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BuddyPress Profile Completion
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SEO SIMPLE PACK
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Social Media Badge Widget
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Data Exchange for WooCommerce and 1C:Enterprise/1С:Предприятие
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Age Gate
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Pages In Widgets
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Additional Variation Images Gallery for WooCommerce
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Bulk Order Form for WooCommerce
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Inline Image Upload for BBPress
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Sport Predictions for JoomSport
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Better Recent Comments
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SEO Backlink Monitor
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Fuse Social Floating Sidebar
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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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BlackBox Debug Bar
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Simple Link List Widget
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Timeline Block For Gutenberg
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WP Editor Comments Plus
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Custom Sender for Email Before Download