Yes, you'd have to create another ascx control and add the functionality you wish. I'm doing this right now in v7. I was going to clone that control but decided I can get the same functionality by creating seperate pages and placing my custom webparts/controls on them. If you think about how the My Account wepart works, it simply places a parameter in the URL to display the proper tab.

I figured why not take advantage of the built in tools for navigation and URLs and just make those URL parameters into pages. Plus it makes the code easier to manage because you have several smaller controls vs. one large one. Hope this helps.