Have different plugins for different sites

Hi,

I look at this plugin: http://wordpress.org/extend/plugins/multisite-themes/ . It adds the ability to have different themes for different sites in a multisite atmoshpere.

My question is: is there a way to have different plugins for different sites?

Now a Super Admin can only activate a plugin for the main blog or for all the blogs (“network activate”). But, for example, I want Akismet activated for a site and deactivated for another site.

Can anyone help me?
Please, it’s very important!

Thanks.