> Change trackpad scrolling speed
If you're on X11, I think you'll have to use xinput to set it manually.
If your on Wayland, in KDE at least this is available in the standard settings application.
> Set up suspend-then-hibernate
On KDE at least that's just one of the options in the power settings ("When sleeping, enter:" has "Standby", "Hybrid Sleep" and "Standby, then hibernate").
> GPU drivers (I have a box with an AMD APU and no idea how to actually utilize it)
Worked OOTB for me, do you have amdgpu drivers installed? What exactly isn't working?
> Many games (Proton is amazing and a huge leap forward, but om average it's still more work than gaming on Windows. eg fiddling with different versions of Proton or finding out that a game's anti cheat will ban you for using Linux)
I find that Proton mostly just works for me, but indeed EAC is a problem that I don't know how to solve (and also don't really care about since I'm not into playing public multiplayer games).
> Higher res video streaming (I think this is usually a DRM issue?)
You should check if HW Acceleration is enabled in your browser, but IIUC Netflix will indeed refuse to provide higher quality streams to Linux (and also Windows depending on your browser), you might be able to resolve it by googling a bit, maybe using a browser with DRM support and switching out your user-agent?
> I'm hoping that someone will tell me I'm wrong and that Gnome actually has an easy way to set the trackpad scroll speed
Gnome is notorious for removing user choices, so I wouldn't be surprised if this was impossible on Gnome/Wayland. Xinput might work on Gnome/X11. Switching to KDE should work on Wayland ;)