Remove class weapon restrictions on ME2

You do get the option to add a weapon class to your character at a midpoint mission, or you can unlock a bonus weapon instead.  So you can have the Assault Rifle, shotguns or Sniper Rifles added to an Adept class, or you can as an Infiltrator get the Black Widow sniper rifle or another weapons class as an either or proposition.  Not completely what you asked for, but it will give you further options in the game later.  It does not stack in NG+ though, you simply get ONE chance on your first play to make a choice, and subsequent  plays this is bypassed and you don't get another.