There is a program/ feature suggestion at http://www.donationcoder.com/forum/index.php?topic=19333.msg173519#msg173519
which I'm sure you'll be interested in, Mouser. To be honest the post is confusing to me at least but it enabled me to remember my suggestion which I posted there (and here -below- for good measure). I hope you don't mind. I'm sure the drag and drop thing would be really difficult but I suggest it as the idea could be beneficial.
My feature suggestion for D&DR, which may exist for all I know, would be for the program to do a hidden "program.exe -?" or "program.exe -help" or "program.exe --h" or various combinations in order to read the help instructions for the command-line program and then display this info and allow for drag and dropping of the various command line elements (in much the same way Word might allow you to drag and drop textboxes). Or a help file could be automatically read in order to scan the appropriate help-switch and other switches. Think of the possibilities.