Adding Elevon as an option when adding RC Function

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1

I have a split elevon configuration on my flying wing, with channels 1 and 2 handling the outer control surfaces, and channels 5 and 6 handling the inner control surfaces. What I set the params:
RC5_FUNCTION = 1
RC6_FUNCTION = 1

I can fly the airplane with the appropriate responses as it just passes through the signal, however, as expected, when I switch to a guided mode like stabilize or Auto, the inner (channels 5&6) are not controlled by the flight controller, leaving the outer surfaces to do all the work.

You can see in the attached picture that there are many options for assigning these channels a value, however elevon is not one of them. Could setting these channels as an elevon be added?

Thanks!!

2

Kept trying today, but I don’t think I can trick it into using it as an elevon. Any tips? Can this feature be added?