An editor generally lets you edit the values of items and/or skills but I'm not familiar with this one as I don't have the game or play it.
I did a quick look around and looks like there's some cheat commands here you can checkout:
There's also COSMOS, a game hacking tool that's available here at CH and there's lots of instructional videos for it.
Staff can be contacted by PM. Caliber's is here:
Merry Christmas & Happy New Year to you, too!
Thanks it will be really good if we can get the Cossack's trainer back.