Kid Charlemagne
I am the Very Model of a Modern Moderator
Back on the topic of the OP - there are some classes in the complete books that would need to be outlawed - kensai, samurai, etc. A handful of martial arts and ki-related feats in those same books. A few Forgotten Realms books also have eastern-flavored classes and feats.
I think Rechan makes a good point in that you can take the mechanics and put them into other places in the world - for example, I did the exact same thing you are doing. In my campaign world there is no "orient." No samurai, etc. I have pulled out bits of flavor to use elsewhere. For instance, gnomes have a tradition of hand-to-hand combat and competition that in my world reflects them keeping in touch with their history, so there are several schools of gnomish monks. I've used Ninja as members of a particular group of assassins and just filed off the eastern name and weaponry. I use the OA shaman as a variant cleric class, but its more of a general shamanistic thing that can encompass native american style shamans just as well as eastern ones.
There are so many books out there that its difficult to give an all-encompassing answer. My recommendation is to tell your players to use "core-only" with the caveat that anything else needs your approval. Let them know what you're looking to avoid, and that way they can do some of your work for you.
I think Rechan makes a good point in that you can take the mechanics and put them into other places in the world - for example, I did the exact same thing you are doing. In my campaign world there is no "orient." No samurai, etc. I have pulled out bits of flavor to use elsewhere. For instance, gnomes have a tradition of hand-to-hand combat and competition that in my world reflects them keeping in touch with their history, so there are several schools of gnomish monks. I've used Ninja as members of a particular group of assassins and just filed off the eastern name and weaponry. I use the OA shaman as a variant cleric class, but its more of a general shamanistic thing that can encompass native american style shamans just as well as eastern ones.
There are so many books out there that its difficult to give an all-encompassing answer. My recommendation is to tell your players to use "core-only" with the caveat that anything else needs your approval. Let them know what you're looking to avoid, and that way they can do some of your work for you.