I’ve started working on this. Right now, the “Instances” tab is done—it shows all WordPress instances on both local and remote systems (using the Webmin Servers Index module). More tabs are coming, like Plugins, Themes, and Stats.
If you’ve got ideas, now’s a great time to share them—it’s easier to shape things while it’s still in progress.
Most fields have tooltips, and a lot of things can be configured through the module config.