Will be possible in a next jose project to implement a option what decrease or increase the rating elo
of a engine as Crafty from "jose" ?
I finally figured out how to login to sourceforge!
Jose already provides this option. However, the option is controlled by the engine. For example, it works with Shredder when used with Jose (just change engine options). It should also work with the free Phalanx http://sourceforge.net/projects/phalanx/ for instance.