Modify total array in confirm screen

Can someone help me with modifying the total array in the confirm screen?

Now it is:

• Subtotal:
  Shipping costs:
  Tax:
  Total:

What I want is to not display the subtotal & tax,if I disable it in the admin screen it does not count up correctly. So it must be hidden in the code.

• Shipping costs:
  Total:

Also I want to modify the text which is listed before the shipping costs.
Default it displays the shipping option you have chosen, but I want to display a custom fixed text.

You can change the order they display in the Extension->Order total.. but subtotal must always be first and total must always be last.. you cannot disable either of those or they will not be included in the calculations and it will be wrong

Ok thanks! I will just let it this way then.

A screenshot of the work in progress (this is page 2 of the checkout):