BP Xtra Signup is listed as working on your spreadsheet. It doesn’t add a root page, so should work just fine for 1.5 as it does for 1.2.x. Problem is that it’s not working properly in a MS environment (and hasn’t been for a while now), as the options page doesn’t show. I know it’s easy to fix, but there never is enough time…
I’ll be testing it thoroughly sometime this week, but until then it might be best to set it to fail, so users don’t get confused. Cheers!