Left handed mode. I didn't realise how much I liked it until no man's sky. It moves the body of the character to the right hand side of the screen. So you can see the character holding the items in the left hand.
Most games just mirror the item into the other hand and that's it.
Which distro are you using. Fedora, manjaro and few others disabled hardware acceleration for certain codecs making CPU and power spike. For Fedora you can enable RPM fusion and install the hardware acceleration versions and be back to normal .
I've been using this guide for ages.
https://fedoramagazine.org/automatically-decrypt-your-disk-using-tpm2/
If you've got an empty header on the motherboard you can get adaptors to make it a normal USB A slot inside the case or a slim profile usb stick. There's a list of recommendations on their forum.
I ended up getting a Dell raid card that I flashed to a normal HBA/IT mode and connecting all my disks with that in a big case.
Happy experimentung. Hopefully you'll find something that fits your needs.
Id go with what ever you're comfortable with supporting, but a few comments.
Truenas core is bsd, Truenas Scale is Linux based. Truenas/ZFS needs direct access to the disks. you should not run it with hardware raid. Unraid loads the OS mostly to ram and the serial number on the usb stick is used for licensing.
I saw someone else summarise it as if you care about easy to use and setup apps use Unraid. If you care more about your data use Truenas.
A few sandwiches short of a picnic.
Won't tick all your boxes but have a look at stationeers.
https://www.protondb.com/ is worth a look. It shows the state of games using Proton and people list their tweaks to make games work. You can filter it to only show Nvidia GPU's on PopOS as an example too. To find tweaks more applicable to your system.