sampoyigi Development is still in progress, however improvements to the TI Core is taking all resources, progress is a bit slow. But will be available in the next release.
Midways I am testing V2.0 Is there a way to implement a surcharge with Authorize.net, say for example 0.65p per transaction. Most of the payment processors I have worked with usually have this facility in the admin payments setup area and you can either select a set fee or a percentage.