Unfortunately SystemUI kept crashing. Ah well, worth a shot. Now to learn to decompile and recompile!I couldn't say as I don't have an S4. You could copy your SystemUI.apk as a backup, then flash the zip to see what happens. If it goes bad, just reboot back to TWRP and move the backup SystemUI.apk back into place. The zip only modifies the SystemUI.apk.