Mhh but hacking prestige tokens is definitely banable! I read this in many forums before... :/
Anyway, it seems to be the only way to get double EXP as long as Anonymouss doesnt fix this bug in his editor!
I used something which only people with VB/VS can see, so other people just can't open it up.
If u do not want to wait and just get the hack working right now ( if u have a problem when u click on the Killstreaks or something like that ) just google "Visual Basic",click on the 1st link (microsoft) and then download it or just wait =P