Yep, sc1103 has it right. Try that and let me us know if you have any problems.
several posts about favorites lists in MAMEWAH, but everything I have seen talks about the list being the games you play the most (where game 1 is the game most often played, game 2 the next most popular, etc.) and not really customizable.
MAMEWAH calls all editable game lists "favorite lists". There are 3 types of favorite lists:
1) "Normal" = Customizable by you. You can add, delete, and filter to your heart's content on this type of list.
2) "Most Played" = MAMEWAH keeps track of the number of times you play every game and updates this list using that information to sort (most played game is always on top).
3) "Longest Played" = MAMEWAH keeps track of the amount time time you play every game and updates this list using that information to sort (longest played game is always on top).
Since #2 and #3 are 100% automatic and maintained by MAMEWAH, you can specify how many games you want maximum (MAMEWAH can only show the top 20, for example, instead of *every single game you play* sorted by most played/longest played.
I hope this helps clarify a little bit.
-sab