In the mamewah config folder for your emulator, you should have an empty "GAME" folder. In this folder, you can create individual command line .ini's for each game you want to launch differently from the master config. Just name each .ini the same as the rom name. Alternatively, you can also you use this technique to create one single master game list for ALL of your emulators. I don't know if there's an easy way to make those games visible on the game list, but what I do is go into the Mamewah "FILES" folder, open the .lst file for that list into notepad, and manually enter the game info. Just make sure you get all the correct spacing in between each game, otherwise it won't show up in the list.