SigmaStudio ADAU145x I2C Bitrate below 400 kHz

I have reached a disconnect between your documentation and your program.

The datasheet for the ADAU145x says the Master Control Port set to I2C communication can support 20-400 kHz and the toolbox help wiki "Master Control Port Runtime Sequential Write (ADAU145x)" says the range is "20 kHz - 400 kHz" however the widget in SigmaStudio version 4.5 gives me options of '400 kHz', '800 kHz', '1000 kHz'.

I am trying to control a device that can only be communicated at <100 kHz. Is there a patch coming?