"Lower body splït" and "Super cardio mix" are the only two Firm DVD's that are chaptered (they are some of the first Firm workouts that came out). I've never seen any others that are chaptered. (And that "play" option on the opening screen is really annoying, because it's the ONLY option).
As far as I know, Goodtimes doesn't chapter ANY workouts anymore.
I guess they decided that people would buy the workouts whether or not they were chaptered, so why go to the bother and extra expense of doing something to help the consumer (especially since they have had extra expenses from putting out crappy first versions of some accessories, like the Fanny Lifter and the Box, and having to replace them!).