Question: Does the software support a custom senderID?

If you enter the word _DYNAMIC_ into the phone number field and you set the
sender phone number of the outgoing messages, you can have any sender Id.
You can read more about the configuration of the driver at:
https://ozeki.hu/p_426-installing-the-smpp-driver.html
and
https://ozeki.hu/p_572-question-how-can-i-change-the-sender-phone-number.html