Is it possible to have access to more channels and ports on the "receiver channel mapping" menu, to get full use of the extra output ports on the Pro? F.ex. when using SRXL or sats-only, it would be nice to assign all the channels on my DX9, making it possible to get full use of all the channels on the transmitter, as I want to use them.

Yes, it might be possible in the future update.

Altough with most receivers you are able to use directly output from the receiver and use SRXL (or other protocol) at the same time.
So you can connect LEDs or other stuff to any free channel (8., 9., ...).

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Spirit System developer

On AR9020 and AR12020 there is access to all channels on the receiver, so there is no limitations for connections, but the AR7700 only have gear, aux1 and aux2 on the receiver, and I guess they are locked to channel 5, 6 and 7. In that situation I want to assign gyro gain and bank switching to channel 8 and 9, releasing channel 5, 6 and 7 on the receiver for other purposes. I haven't got the AR7700 yet so I'm not 100% sure there is a work-around on this or not, but I hope you understand why I want full channel assignment.