Hit markers can take or leave. Auto-pick-up with custom rules (than the ones the the mobile version has) would be nice. Having the "inventory pick-up" box not be full screen (like the small square in the mobile version) where you're able to quickly choose what you want to pick-up instead of it taking up your entire screen. Better matchmaking (HUGE), season rank rewards, daily login rewards, etc.
There's plenty they could take from Tencent and it just shows how amateur hour Bluehole is with 1.0/out-of-early-access! release is.