Well I would LOVE this feature.

Is there any way to mount an ISO to the XMB? Like launching a homebrew and I choose what game I want to load and that gets mounted onto the XMB?

An example of what I mean is when on the PS3 you launch a backup manager and you choose what game you want and it gets mounted to * /app_home/PS3_GAME/

Or another example is how UMD videos get mounted (the ISO), anyway to do that with a game instead of a movie?