Less time required for a Right Button press on mobile devices.

Potentially impossible as it runs on the browser and might be a native thing of the device.
If impossible open an issue requesting alternatives to flagging the cells on the mobile devices.

Idea :
- Have a timer than on key down it starts, and after X amount of time it would place a flag as if it was a right click.
And on key up it checks if it was lower than X amount of time it presses and resets the timer to be ready for another key press.