You can open Gnome-tweaks from the app menu. Open the app menu and start typing tweaks and the autosearch will put tweaks first on the list in the menu.
Open Tweaks and navigate to Keyboard and Mouse.
At this point, you will need to explore the settings and see if anything there helps you. I do not use the Gnome Desktop, so I lack experience with its settings sometimes.
No unfortunately. Gnome tweak had the options, but enabling them does no good. I've even rebooted. (I'll post new topic about sound after this touchpad issue)
I have been using 16 for several modefinitelynths without any issue. This definitely the most stable beta OS I've ever used.
But you can also try out version 16 in Live session without installing to see whether newer kernel/drivers make any difference for your hardware. In my case, it was a big improvement for my trackpad.
I think you would better test Live session before making any decision. I am determined to do a clean install myself since I will purchase the Ultimate edition when it is out.