No-no, if it allows only fixed choices and nothing more, then it probably doesn't worth it. And I'm actually not ready to describe what I need exactly. I know about the "ask" function, and will check what it can do for my purposes.
Right now I'm working on scripted failures engine and don't want to mess with dedicated GUI for it, so I need some space to display current systems status (will try to use Lua display for that purpose) and some instruments for user interaction to set things up (like setting max speeds for different flaps positions for current aircraft, switching some failure modules on/off and so on). This could be done with XML-gauge, but it will require to edit panel.cfg for each aircraft and I don't like that, so I'm looking for an easier and yet universal solution.