A: Yes, via the built-in Steam Input. You can set a button to "toggle turbo" on the A button. Steam Deck macros are currently considered low-risk by NK.
Use the in-game Tech Bot. Run AFK strategies on Deflation. Buy a mouse with a turbo button for rapid clicking (legal everywhere). btd6 macro
A: Generally yes, as long as you are physically pressing the button. If you wrap a rubber band around the mouse to hold it down, that is unattended automation (no). A: Yes, via the built-in Steam Input
Use AutoHotkey scripts with time limits, never share them online, and assume you will eventually receive a 7-day suspension. Use the in-game Tech Bot
#Persistent toggle := 0 F1:: toggle := !toggle if (toggle) { SetTimer, ClickStart, 1000 ; Clicks every 1 second } else { SetTimer, ClickStart, Off } return