sirocco as wireless ethernet bridge?

Can I use the Sirocco's ethernet port to connect other equipment to my wireless network?

Yes!

Yes, the Sirocco will act as a bridge between wired ethernet segments -- it actually causes them to be connected together into the same LAN. You should not need to do anything to make this work -- all you need to ensure is that the Sirocco is connected as a client to your wireless network.