I'd like to have a button (like where the start, pause, etc. buttons are) that turns on the "Stop after this game" option to stop the bot.

And perhaps the option in the settings to keep the "Stop after this game" option on even after the bot has finished the game.
The bot use to do this. With that option on, the bot would only play one game and stop. It is a useful feature for single player mode.

Yes, I know. I mean like the start/stop, pause button. Like the minimize hearthstone window button.