+1 for including labels/tags/grouping ability for sites.
We used this on WPEngine to group sites by sub-industry. And on ManageWP Orion we use labels/tags to manage sites. Would be great to have consistency across platforms.
I'd also like to see a 'Total Sites' count somewhere on the sites list page please. Don't think that needs to be an additional feature request.
Filters and pagination. Maybe use a Datatables implementation for this which allows for filters and search quickly via JS? datatables.net/ This is supported in Laravel AFAIK (not sure if you're using Laravel for the dashboard) and is very easy to implement: github.com/yajra/laravel-datatables
Please make it sticky so it's remembered. Also, please support more than 100/page.
Maybe add some filters, like show only the sites on a specific server, or allow us to add tags so we could filter clients' sites on a specific care plan level.