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Either run the game outside of Steam through a script, or use %command% (expanding to the command Steam would normally use) anywhere in the launch options box to run a customised launch command.
It does require a bit more knowledge of the command line to work, and differs greatly whether you play on Windows/Linux/macOS, but it's already possible.
As for backing up saves, you could instead schedule a backup script to run at a time the computer would be idling, being careful not to switch it off during backup operation.
That right there is why Valve won't do something like this. There are warning messages all over Steam about not giving away your info yet people still do and get hijacked.
Warnings about not downloading and running random stuff off the internet has been given to people for as long as the internet and hackers have been a thing.
Most people don't know how to do scripting and would require to download something off the net. This would be a very dangerous thing to add to Steam. If you want to do this, do it yourself. There is already programs out there that can save all your save games every now and then when you run it.
Gamesave Manager is one of them.