The latest tivoftpd source code is here. The version you patched is based on oftpd 0.1.3. The new version is based on oftpd 0.3.8. The new version includes multithreading, honors connection limits, and fixes issues related to the slow directory listings. I also added inetd support amd disabled TYPE_ASCII transfers.
If you are interested in patching that version, I will compile it for mips and add the ppc version to it. Thanks for the update.