Hi Dave,
Not all of the FTMs have quadrature decoders.
The two 2-channel FTMs (FTM1 and FTM2) each have a quadrature decoder.
The two 8-channel FTMs (FTM0 and FTM3) each have a 3-phase motor and 2 general purpose or stepper motors.
In case you need any more information on the K64F, I think the K64 Sub-Family Reference Manual is the document you were missing. You mentioned the data sheet but not the reference manual in your post so I wanted to make sure you had access to both.
Here is the link to the K64F on the NXP website:
https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mc...
At the bottom of the page there is a section with all of the documentation for this device. The document I used to answer your question was the “Kinetis K64: 120MHz Cortex-M4F up to 1MB Flash 100-144pin” under reference manuals. Specifically, page 137.
Thank you for your question!