How about a module that can tell you which other modules are currently running? I have not dug deep on this one.. just a thought.
For example, DNSMasq Spoof, wps and other modules have a button (start / stop), where you can start and stop that particular module. There is no other real indicator in the GUI showing that the module is running, so if you leave the module's page you have to just remember which ones are running.
It would be cool if there was some sort of standardized api/hook that can tell if a module is currently running (maybe there is one already), and change the color of the module's text in the left navigation pane using CSS. This way I can tell at a glance which modules are up and running, without having to click through each module.