Hi @LightningKing
Now if you are running in an Attended Mode, then I believe you can set to your flows to start the flow by going to the 3 dots next to your flow and choose the properties, there it will prompt for "Run with keyboard shortcut" you can set your short cut to start but you will get pause button then you can click that button to pause your flow, I believe currently we don't have shortcut for stop

If you desktop flow is running through cloud flow then you can go to settings next to your environment and you will have different properties to set


It's better to keep different keys, instead of one
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Regards,
Srini