This trend of needing to network activate wpmu dev plugins is disconcerting. Marketpress, ultimate faceboook, etc..
I don't want to have a facebook menu on blogs of clients who have not paid for me to set them up with a facebook sync...
I don't want clients who have not paid for a shopping cart solution to have the marketpress menu hanging out tempting them to play with it... etc.
How about instead of network activating them, we activate them on the primary blog, and on the appropriate sub-blog? could this work?