Vertical tabs support

I don't know if its a bug, or a feature request. I have a bit monumental node addition form, i need vertical tabs.
Inline Ajax Login do works, it detects the existing user, and logs in with the correct password, but the user don't get any sign of the latter. The login form just stays as it was before, like the user didn't clicked on the login button. If you refresh the page, or press the form's Preview button, the 'You have been logged in.' message is shown, but not sooner.

Thanks,
David