You can create your own template by putting a file in C:\Users\you\Documents\Visual Studio 2010\Templates\ItemTemplates\Visual C#.
For example, you can put "publicclass.cs" with this content :
using System;
using System.Collections.Generic;
$if$ ($targetframeworkversion$ >= 3.5)using System.Linq;
$endif$using System.Text;
namespace $rootnamespace$
{
public class $safeitemrootname$
{
}
}
In order to avoid the class dialog, you can use the smart tag. Anywhere you would to use an inexisting class, simply type the class name, and press AltShiftF10 to popout the "generate class" menu.
