Chuwi engineers are aware of the two keyboard backlight issues that you have stated. I was informed they are currently working on releasing a corrective software fix. I would assume that it will be sometime after their Chinese New Year holiday break.
For a work-around on the backlight coming on during the key press, you can disable the fast startup under power options/choose what the power buttons do. By disabling Fast Startup, the keyboard backlight will no longer come on with a keypress.
For the heat issue, I recommend changing the Minimum Processor State to 5% under Plugged In (and On Battery). I had the same issue with high temperatures until I change this setting and I noticed the UBook Pro running a lot cooler after that. I noticed no change in performance since the maximum process state is still at 100% and it has no problem scaling processor usage.