but you should be able to increase the timer by editing /etc/defaults/grub/etc/defaults/grub, but dont change too much in there, stick to just changing the timeout
Not directly no, as implied by its name. However, you can probably replicate its functionality manually because MO2 itself doesn’t require Steam, for example
An easy-to-use Mod Organizer 2 installer for Linux - GitHub - rockerbacon/modorganizer2-linux-installer: An easy-to-use Mod Organizer 2 installer for Linux
That's a personal preference sort of thing. I know folks who do either, some professing smooth gameplay while others professing not having tearing is more important