as far as I remember theres no easy way as the host tabs are automatically added during installation (unlike portal admin tabs which are template controlled). You can manually remove the entry in the database i.e.

the control for the sql can be found @ admin\Portal\SQL.ascx , you can delete it (as well as it's .vb and  .resx files), if you want to clean up after it.

Finally, you could also tweak the 01.00.00.SqlDataProvider and DotNetNuke.Data.SqlDataProvider files in Providers\DataProviders\SqlDataProvider and remove the line that add's it in i.e.

"INSERT INTO [dbo].[ModuleDefinitions] ([ModuleDefID], [FriendlyName], [DesktopSrc], [MobileSrc], [AdminOrder], [EditSrc], [Secure]) VALUES (65, 'SQL', 'Admin/Portal/SQL.ascx', NULL, -1, '', 1)"

no, it's part of the initialisation of your primary portal, so you would not have to re-do any sql steps. However, after an upgrade, the files would be replaced, so you would need to remove them again if you want to clean up properly.

Cathal