It is not possible to run in both modes. There is a different software load that goes onto the appliance depending on which mode you are using.
And the two are separately licensed for the number of devices simultaneously connecting.
This is no longer a Juniper product, you will need to move the discussion and get your license, software and documentation over on the Pulse Secure site.
forums
https://community.pulsesecure.net/t5/Pulse-Secure-Forums/ct-p/Forums
documentation
https://www.pulsesecure.net/techpubs/