I do agree that the staging of violence in the play is of utmost importance, and I think it is aimed at forcing the audience out of the comfort of their seats and making them experience this violence, to shock them out of the position of passive observers (not only as audience, but in our attitude to everyday violence), similar to what the Soldier does to Ian to show him that the acts of war violence heĀ“s been telling him of are just as "personal" as any of the stories he writes by making him expierence them himself. Anyway, I think one should be careful not to reduce the staging of the play to a Tarantino pulp pageant, otherwise KaneĀ“s powerful images would not carry as much weight - I actually remember reading, I think it was in IanĀ“s site, that Kane hadnĀ“t liked it a bit when Blasted was staged in Germany with excessive nudity and putting the stress solely on the physical violence.
By the way, IĀ“m working on a paper comparing the treatment of violence in Blasted to PinterĀ“s Ashes to Ashes, any ideas are more than welcome!