there is no way via the interface to do this - you can manually edit the default.aspx.cs and remove them from towards the bottom of the InitializePage function , though we never recommend core edits and you will have to remake these updates everytime you upgrade. As for the title tag, it's an annoying one, we simply use the asp.net code of page.header.title to set it (http://msdn.microsoft.com/en-us/library/system.web.ui.page.header.aspx) and asp.net for some reason does not place it first - ive never had a chance to dive down into it but I'm guessing its more correct to have it placed as the final tag before the head (as asp.net does) than as the first (as seems logical)

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Just in case anyone else ever sees this thread and needs to do something similar then if your page skin has a code behind file then you can use the following code to remove an existing meta tag and replace it with one of your own choosing. I had to take this approach because we have multiple sites on the same installation and only one of those sites wanted their site to be excluded from search indexes. As always use this at your own risk but it works fine on our installation.

Try
'remove the existing MetaRobots entry
page.Header.Controls.Remove(Page.Header.FindControl("MetaRobots"))

'build our own new entry
Dim mymetatag As New System.Web.UI.HtmlControls.HtmlMeta
mymetatag.Name = "robots"
mymetatag.Content = "noindex, nofollow"
page.Header.Controls.Add(mymetatag)
Catch ex As exception
'catch an exception if MetaRobots is not present

End Try