Linux Crack Tips

I've been considering buying a Steam Deck but already having a decent PC I don't know if it's worth upgrading my PC or buying a Steam Deck.

I have a mid-range PC that runs any game nowadays, but I'm used to playing on console and I'm really more into programming and working on my PC, and what I like about the Steam Deck is that I just take it wherever I want to use it and I have everything ready to play, unlike a PC where for example, for emulated games I would need to look for a controller.

I guess I will buy the Steam Deck, but there are two things that concern me:

1. How can I add pirated games to my Steam library? Honestly I'd be lazy to have to go into desktop mode every time I want to run a game. Is there a way to add it directly to my Steam library? I understand that Heroic (Epic Games and GOG Launcher for Linux) has an option to add the games automatically to the Steam Deck library, adding my pirated games there would add them to Steam or is there a similar method to do that?

2. What is the emulation situation in the Steam Deck? I guess the Steam Deck is able to run almost any Switch game and some PS3 games, but I remember there was an emulator launcher specifically designed for the Steam Deck, does anyone know which one it is and if it is possible to open it directly from Steam?