Apple did this with MPW back in the day. I think the feature was called "commando". You would type the command name, then "..." and up pops a dialog box with

Apple did this with MPW back in the day. I think the feature was called "commando". You would type the command name, then "..." and up pops a dialog box with all the options and popup help for what different things meant. As you fiddled with the GUI, it would generate the flags as text you could see. And finally, you could execute, or paste the command line text into the console, or both. It was awesome.