Just had same prob
You can go to the
http://jed.diabloworld.com
THere u must go to "my pickit" in left side of the creen there u must register and then it's quite easy to make ur own pickit file...
u can find codes same site u found mypickit thingy just a little lower.
After u have completet ur new pickit u can download it and then u go to Jed\javascripts\include\itemfilters and there u remove the existing "pickit-items file with the pickit u made urself and then u just rename it to pickit-items.jed and there u go new pickit for you