If you want the system to automatically select only between specific channels (e.g., 1, 6, and 11), this can be done through the CLI using UCI commands, as described in a similar topic here:
For example, to allow only channels 1, 6, and 11 on the 2.4 GHz radio, you can use:
uci set wireless.radio0.channels='1,6,11'
uci commit wireless
/etc/init.d/network restart
You can apply the same approach for your 5 GHz radio by listing only the desired channels or range to be available.
I should add I am running 7.17.5 (the stable base firmware).
Is this something that will become available in the firmware or will it remain in CLI? How will the changes handle a firmware upgrade? Will they be overwritten?
At the moment, this functionality will remain available only via CLI. If you perform a firmware upgrade with “Keep settings” enabled, your configured radio channel settings won’t be overwritten.