Was v0.6.x supposed to have this included? I don't remember if Pete said it would pr not but from what I do remember I don't think he had planned for this to be in v0.6.x. There is a market application that I know of (and possibly more that I don't know of) that will allow you to do this. Power Control Plus has an option to have your customized power control widget in the notification bar.
Edit: Power Control Plus isn't a free application. Thought I'd toss that in. There might be free appear that do the same but I have no idea.