I have a couple of ideas for additional entries. Unfortunately, I do not have any ideas for cool names for the entries, but I will describe them as best as I can.
1. The joy of feeling special and powerful. It is the excitement of using all your kewl powerz that make you unique. I don't think this is the same thing as Ludus nor Fiero, but similar. I think those people who like to tell you stories about their character often have this type of motivation. The story is often something like, "and then I used my Sneak Attack ability to kill the evil wizard that no one else in the party was able to effect at all!" This might sound like I have a negative view of this motivation, but I do not. I have some fun using kewl powerz myself.
2. After a lot of self reflection, I think my own primary motivation and "What I Like" is the feeling of being smart. I want to figure out the riddle, come up with a cool way to defeat the villain (using only a head of lettuce, a roll of duct tape, and a spoon), find the murderer, etc. It is similar to Ludus, but not just in terms of the mechanics of the game. I do want to use the mechanics well, but I also want to be smart about the other elements of play (the plot/situation my interaction with other characters, etc).