imho stupid firing is made by lag. And lag is cuz droped fps. If u will read lnk down u will know low fps keeps ur fire on. So we need to remove droping fps. Maybe switch vsync to off can remove that problem. There is a lil forum about this problem situated here :

http://forums.logitech.com/logitech/board/message?board.id=general_mice&message.id=1087

also maybe some commands will fix it :

r_swapInterval "1"

or

r_finish "1"

i didnt experimented with these 2 commands yet.