Honestly didn't tried to convert /system because usually there are some problems, and no gains will come from that except maybe boot time. /system partition after boot is a Read-Only partition. However i could try to convert later.
Installing any rom without modification will probably format /data and /cache to EXT4. You can install and then you have to format again to F2FS (without -rm option).
This Kernel will (probably) work only on stock roms, it was tested only with 1.64 version.
I will release a new version right away. I have some improvements implemented, including OC/UC and new IO Schedulers.