NVidia still hasn’t implemented support for adaptive sync with multiple monitors in their driver. If you can connect the second screen to the integrated GPU, that would work though

That’s because Windows has a system provided toolkit that most apps use

long press for imitating a right click, but text selection with popup copy/paste/etc buttons would also be useful.

Unfortunately that’s not something that can be done system wide, apps have to handle that themselves.

afaik not packaged for any distro

It’s packaged in every widely used distro.