Sharing data/database for plugin(s) across sites – possible?

I need to have a plugin act as one plugin across all of my sites.

I can activate the plugin network-wide from the Superuser plugin panel, but I need to have it use the same data I enter in the superuser panel on all sites.

Is this possible? If not, it should be… ??

Main reason is that I’m running a couple of different “sites” on 3.0 with one store. I need the store to show up the same on all sites – rather than installing it on each and needing to update the data over and over every time I add a single item.
The plugin also has the ability to post the item into a blog post. Being able to that from any blog from the shared database would be ideal.