I was just pointed this way by h3o, thank you for sharing this! I wanted a way to scale the in-game resolution by 2X (1280x720 in-game, to fit a 2560x1440 screen), and this solved it. Hopefully a future W:A update isn't too far away.
After setting this up, I noticed that the frontend menu was now displaying in a 1280x720 window despite having SuperFrontendHD installed. If anyone else is encountering this, open your Worms Armageddon installation folder, and edit the file "wkSuperFrontend.ini" in Notepad/++. Under [Misc], look for (or if missing, add the line) "Resolution=" and set it to "Resolution=Desktop". This will force the frontend to run at fullscreen resolution again.