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Are you trying to customize your WordPress Dashboard across ALL wpmu or wp3 Multi-Site blog networks?
Remove ALL WordPress Dashboard Widgets! Network Activate To Use Network Wide!
What This Plugin Offers!: 
Configure Once! Network Wide! 
Remove ALL default dashboard widgets! 
WP3+ & BP 1.2+ Compatible!
Why Use This Over Other Dash Widget Removal Plugins?: 
Most of the Plugin Solutions are on a per-blog basis, no sitewide configuration!
Existing solutions do not remove ALL dashboard widgets!
<h3>Features</h3>
Configure Once! Network Wide! 
Remove ALL default dashboard widgets! 
WP3+ & BP 1.2+ Compatible!
<h3>Coming In Future Versions</h3>

Dashboard Widgets Network Removal

Remove All Dashboard Widgets In Single WP, Or Multi-Site!

skunkbad

PHP V5+ only! This plugin deletes spam from the comments table of the database. It does so by checking it for matches against the characters or words you have blacklisted in Settings->Discussion. Also on the Settings->Discussion page is a setting for the maximum allowed links that a comment can contain. This plugin will delete comments that have too many links. Spam can also be deleted if it has a url in the author url field. This is handy if you don’t have a author url form field in your comment form, and bots are submitting without using your form. Finally, spam can be deleted if there are any non US-en keyboard characters in any comment row. I don’t expect any foreign language characters on my blog, and while I know this setting may be a little harsh, it’s a spammy world out there, and sometimes ya gotta do what ya gotta do.
This plugin adds a menu item in the Settings section of the admin area. Currently only three options are available:
1) The frequency to run the automated process of removing spam. Default is twice a day.
2) Whether or not to remove spam that has been submitted with the website field. Default is NO (unchecked).
3) Whether or not to remove spam that has non US-en keyboard characters. Default is NO (unchecked).

Chronological Spam Removal

Plugin removes comments from the comments table that match blacklisted items, have too many links, or contain a author url (not default), or have non  …

Dashboard Widgets Network Removal vs Chronological Spam Removal