There is a French edition released on 2002-2003 which didn’t contain any special feature, but it came with a magazine (Mad Movies, the title means everything) with a one page article about the film and some details. For instance how did Robert Powell came to star the film? David Hemmings (Senator Nick Rast) was in Australia to make Thirst and when he was approached for the film, the producers asked him if he had an idea on who could play Gregory Wolfe and he replied without hesitation Robert Powell!
The Synapse USA edition 2008 is up to now the best as it contains the Audio commentary with director Simon Wincer and producer Antony I. Ginane in which they mention that Mel Gibson was very interested in playing Gregory Wolfe. There is also a behind the scenes photo gallery, it would be fine if it had been commented as you see many people you suppose are the director and his assistants, but there is no mention. Here are some pics :