What is the best way to do this seeing that im not using Keyclone (scared of what I dont know plus im using Vista 64 and I here there are some problems with that) Anyway that being said I really need to stagger my Thunderstorm spell. Im not sure if I am using the correct terminology though.. What I want to do is this

Bind my 5 key so that when I press 5 my first char casts thunderstorm press it again next char casts thunderstorm and so forth and so on until all 5 chars have done that.. Then I would like to bind Shift 5 so that they all cast it @ the same time (That part is easy and I have no problems with that one as its just a key bind)

Any help I would grealy appreciate!