Add Subsites to WPMU Dev Hub

Hi,

I would like to add my network subsites to "My websites", and configure hummingbird, and other plugins that are only allowed to the main domain of the network. How can I do that?

On hummingbird for example, on a subsite, I am only allowed to configure minification... I would like to touch what the main domain can: such as cloudflare, gzip, etc...

Thanks!