Version 3.1: Released on July 6th 2017
Already saved custom total will now be seen on order edit.
Version 2.1: Released on October 8th 2016
Now you can add taxes with custom shipping and custom totals.
Version 1.1: Released on July 23rd 2016
Extension release for 2.3.x
Version 1.1: Released on July 15th 2016
Extension release for 2.0.x, 2.1.x and 2.2.x