Sadly the answer appears to still be "no".
Interested in a workaround? You can set up folders in your list of Smart Mailboxes, so when you tap the mail app, you'll see those folders there with an unread count. My mail badge says 30, but I tap it and see two folders I also monitor, one with 36 unread messages and the other with 45. Or if you don't care about folders, enable the Unread Smart Mailbox and you'll have all your unread messages in one place with the total shown (mine would be 111). When life gives you lemons...