[Elias]

[…] I don’t think it is really using much (if any) MySQL specific code.

bbPress uses a lot of SQL statements not working with Oracle and is highly optimized for MySQL. To make it independent from the RDBMS will not be easy, and coding a RDBMS independent layer and not using “JOIN”, “LEFT JOIN”, “MATCH” and “FULLTEXT INDEX”, “LIMIT” would degrade the performance of bbPress, which isn’t exactly the thing wanted for it.