Wow, I can actually contribute here. I have both modules (well 3 if you count the karaoke module) for the LaserActive.
I have the US versions of the hardware, though the LD's themselves are not region encoded (like PCE cds). I us my LA system as my main Turbo system to play my PCE games, the shape of the system calls for a different convertor for the sustem cards (the "big green diving board").
There were only 3 games released for the US version
Vajra (the fmv shooter described above)
Quiz Econosaurus (ecological/educational game from Hudson)
Manhattan Requiem (JB Harold: Murder Club sequel)
Of course many more were released overseas, many games were released on both the PCE LD and the Sega Megadrive LD. Finding JB Harold: Blue chicago blues for the LDROM2 would be great! As would many of the animated LD games like Time Gal.
There were 13 (i think, i can check if any1cares) total US Sega LD games, with MAYBE 5 total games worth owning.
Going thru Blue Chicago Blues right now (sega version), if any1 needs any more info keep this thread alive!
later gamers