I’m assuming you’re using the “game list” utility that comes bundled with MaLa, and if so, I agree it’s a pretty tedious process to make a list of any appreciable length. Not only do you have to scroll through the thousands of games, but it’s not always obvious which ROM goes with which game—especially ones that have multiple versions.
One feature I just discovered recently in MaLa is that if I hit my player 2 start button, it brings up a menu of some nice features, including the ability to add a game to a list from right there within MaLa. I think you still have to create the list itself in the other utility, but once it exists, you can dump games into it from the main game-selection interface. This way, you can be sure you know exactly what games and what versions you’re adding to the list without the trial and error.
I’ll second what the other poster said about the fun to be had in discovering new games. If all you do is play the same old Galaga, Asteroids, Donkey Kong, Dig Dug, and Pac-Man you’re really missing out.