Radiohead ASK push to talk pin

Other Hardware Sensors
1

Hey I'm using a radio transmitter and receiver on a arduino nano with the radiohead ask library. When defining the module, it asks some parameters just like this:

RH_ASK (uint16_t speed=2000, uint8_t rxPin=11, uint8_t txPin=12, uint8_t pttPin=10, bool pttInverted=false)

I was wondering, can I just set the PTT pin to an unexisting pin and is it even possible? I think its purpose is to disable the receiver while transmitting, but I tested (with an LED) that it does that automatically so it seems just an output pin? My purpose is to save that pin for something else. Or could i just set it to an analog pin A0 to A5?

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