Morning,
Some of my clients have multiple websites, some are Resellers but don't use the reseller functionality in ECP, and I have multiple websites to deal with.
When these are listed, the list can get really long. In terms of good management, would it be possible to favorite websites in the 'manage websites' area of ECP? Once you do, the favorited websites are placed at the very top of the list (still in alphabetical order - or whatever order you previously selected)? Perhaps symbolized with a favorite 'star'. Simply clicking the star could remove them as a favorite as well. This functionality could also spill over into the 'manage customers' area.
To go one step further with this list, perhaps forget the option to favorite a website, but an option to drag/drop to re-order the list instead. That option could be in the cog icon, under Grid labeled 'Re-order' (not sure on terminology).