Can I use SpeedyBee F7 Mini on a Y6 or HEX quad?

Yes. To do so, we need another two signal pads for another 2 channels of ESCs to control another 2 motors.

For the SpeedyBee F7 Mini flight controller, you can connect it to the Betaflight configurator, go to the CLI page, copy and paste the following code:

resource LED 1 none
resource CAMERA_CONTROL 1 none
resource PWM 1 none
resource MOTOR 5 PA0
resource MOTOR 6 PC8
save

Then the CC pad and the LED pad will be remapped as motor output. That means you can use them as M5 and M6 motor control signals.