Hi there,
Welcome to the Community. I'll be happy to share more info about how GST works in QBO.
At this time, both expenses and income are recorded in the GST Payable. When you file your taxes, the amounts are transferred from the GST payable into the Suspense account. I know how useful this feature would be useful to you and I encourage to send this as feedback to our product developers. New product ideas are based on the great feedback we get from users like you.
In case you have other questions, feel free to contact our support team using this link here.