I too would really love this enhancement. Being able to configure widgets that respond to a single key press is the only thing keeping me from adding multiple touch-screens to my Automation implementation.
If you could add the functionality such that while creating the widget you also select the action taken when the Widget is triggered, that would eliminate the need to have the widget pop-up and requiring a second user-interaction. If you wanted to make it fancier, you could have a widget that would act like an on/off toggle. Further enhancement might be displaying the status on the actual widget ICON, so if a light is ON, the widget is illuminated, and non-illuminated if OFF.
I've been searching for a solution to create this functionality myself for quite some time, but I am admittedly not a software engineer and haven't found a solution that would be as clean as a direct Mobilinc widget upgrade. I've looked at using Tasker to accomplish this, but again, its not as clean a solution as i would like.
If anyone else has any ideas or things that have worked for them, I'd love to hear about them.