Each site has its own setting and groups of plugins. So you can’t create a group at the network level.
I think it would make sense to have it work on superadmin dashboard too, you have groups there, and choose default plugins orders, then settings gets overridden by subsites preferences if any.
It would be a nice feature but each site has it’s own settings and the order of the plugins is the order that they appear in the array saved to the database for the active_plugins option. This is saved for each individual site and is part of the core. This plugin just changes the order in which they are saved to that array. The network does not have that option.
You could get/use the data from the main blog and re-use it for sub-blogs.
