The only option for downgrading you have right now would be a hardmod. But there are some reliable members on here who would be happy to do it for you for $20 or so. If all your interested in right now is userland homebrew, just wait a little longer. I may or may not have something planned.
Im not keen on hardmod as i want to keep the hardware intact.
I'm freely new to the modding scene, was last a gw user. In simple terms, is there any possible ways of breaking the system to install games in the near future?