You could make a script to use these files but a cut-and-paste makes more sense to me unless you really want these usually filtered and removed roms.
My idea is to read those ini files at layout launch or romlist load, then create properties in the game list for them. Thanks to the internal game list in Arcadeflow I can add properties that are not currently in the romlist... In this way when you look at the details of a game you can see if it has a rating, and if it's part of a series.
With the "more of the same..." search function you'll be able to filter your games to show the ones in the same series as the current game, and you'll be able to sort by serie and by rating. Of course it will apply only to the games you currently have.
I just have to find a smart way to parse this huge files, or maybe output a simplified version to be used in the layout (like it does in history.dat)