Trebuchets aren’t really a tool for defence. They have tremendous range and aren’t exactly speedy to load, aim, and launch.
Unless you meant defence in the same way that a country’s military operations are known as “defence forces” regardless of intent, in which case carry on.
I’m playing through New Vegas right now. I have one of the back buttons assigned to quicksave. I also changed the default camera button to one of the back buttons, because I don’t use it often enough to warrant it being on the bumpers. And I have just assigned one to toggle collision, because sometimes you need that when playing something built in the Gamebryo engine.
This is useful for countries where the Steam Deck is unavailable but other handhelds aren’t. Here in Australia, Steam Decks are only available as grey imports, and that makes warranty issues a potential headache, but you can walk into most electronic retailers and buy a ROG Ally off the shelf.
That said, I personally wouldn’t buy a handheld that didn’t have touchpads, so I bought a grey import and have had no issues.