Well, as far as showing certain games, you could
A- Show parents and clones, and just have the games you want(pacman et al) in your roms directory
B- Use the game type settings(Im using an older version that writes an info line directly into the advmenu.rc, I geuss newer versions use an xml file), SHow parents and clone,s but show only the type you select
C- Show parents/no clones, but map one of the buttons on your CP to "play clone" so you have easy access to the real pacman if you want
I use C, the only types I use are for majong, so I can not show those. In order to consider pacman the parent and puckman the clone, I think youd have to hack mame itself, so that the gamelist it generates has the info you want. Ive got no information on the ease or difficulty of doing this
What display mode are you using? (tile_small, list, mixed etc) One of the modes does use different artworks, its liek a text list on one side, and the other 1/2 is the marquee, screen, CP and cabinet/flyer
I use tile_normal I think, its like 5x6 snapshots with just a line across the top and bottom for status & info. I find this the easiest for large numbers of games, since yo ucan scan the screen and see 30 games, if you dont see what you want, move the joy stick for the next page of 30
Ive got the menu showing Title screens, the preview(what it shows when launching a game set as the Flyer, and the slideshow screensaver is showing the screen shots, so even in a normal mode I get to see more than just screenshots