KatKiss 5.1.1 #27 for TF700t / using ext4 data partition rather than F2FS

Hello,

First of all, sorry for my awful english.
I've installed the KatKiss 5.1.1 #27 rom on my FT700t throw TWRP 2.8.7.

TWPR don't allow me to change data partition to F2FS (error wipe data) and I dont't have used KANG TWRP recovery who allow this.
Even it's indicated that this rom is only for F2FS data partition, it works fine with EXT4.

Could i have problems later ? Can i really use this rom with /data EXT4 ? Are there known issues ?

Thanks !