Scheduling more than one change of state?

I don't seem to be able to schedule more than one change of state in a workflow for a node -- or at least, as there's no list of thee change I've scheduled, I have no way of knowing if adding a second scheduled change works or overrides the first one.
Is this possible?

What I'm trying to do is create a news story list on the front page of my site using a node queue. I have three states in my workflow: Pending, Current, and Expired. When in the Current state, the node is in the queue and removed when it goes to Expired.
I'd like editors to be able to schedule both when the node goes to Current (so you can post news items about things you know will happen, but shouldn't be shown to the public yet) and also when it expires. So ideally, the whole process of a single node's lifecycle is set up when it's first created.