Sorry for the delay. Not sure how I missed replying to this one. The system is created to have individual listings for every game and every variation. This is why we have broken out regions and most classic gaming collectors try to complete an entire US or PAL set. Even if the games are not region locked such as PS3, they still have unique part numbers, release dates, etc for that region.
I think a solution to your problem would be a way to group titles together. You search for MGS3, see one result, click it and there is the info or links to each region. I'll be looking and experimenting with some ways to smooth this out soon.