Looks like I can answer this one myself now.
It seems like NXP have released KSDK 2.0 without any announcement or fanfare on 28th Jan, the day I posted the above message.
I found this in the api document.
23.2.3 Input capture operations
The function FTM_SetupInputCapture()sets up an FTM channel for input capture. The
user can specify the capture edge and a filter value to be used when processing
the input signal.
The function FTM_SetupDualEdgeCapture()can be used to measure the pulse width of a
signal. A channel pair is used during capture with the input signal coming
through a channel n. The user can specify whether to use one-shot or continuous
capture, the capture edge for each channel, and any filter value to be used when
processing the input signal.
Hello:
Sorry for the delayed response. You are right that both modes should be supported in KSDK v2.0.
If you find any problems using these modes please let us know.
Regards!
Jorge Gonzalez