4K is not supported by our libs so impossible right now.
1) Zero Shutter Lag (ZSL) : yes our sensor support zsl but its disabled by camera apk but we can enable it editing string.xml
2) RAW mode capture : Although its not possible to enable ZSL and Raw mode both at the same time. We can capture RAW images
Few other options are there like video HDR and hfr(didnt worked). If you wanna find out ourself.Try decompiling the camera apk then goto res/values/string.xml open in notepad and search for default..ull find many results