Yup
The line running aft on the port side of the pic is my topping lift. When at anchor and not using the boom as a ridge pole for my shade tarp, I hang the boom off to the side supported by the topping lift to allow more cockpit headroom. That is about the only time I use it. When raising, lowering or reefing the main I hook the boom onto a short (6") lead attached to the backstay which not only holds it up, but keeps it centered (and the boat headed into the wind).