the client is hard coded there is no by choice altering, but seting valus in Db to lesser number of expansions will turn off expansion races (along with expansion zones however)
BUT I will tell you of little trick I made on my server.
All players start in Tutorial zone and cannot exit unles npc ports them out.
NPC will do a check on your class and race and will not port out combos which are not allowed on the server =)
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