Here's a plugin, made with the fantastic Dark_Alex's SDK, that allows us to autoboot into a 271 kernel aplication, instead of a 1.5 kernel one. Great for IR Shell.
How to use:
-extract to ms0:/seplugins
-add he prx to vhs.txt
-enable the prx from the recovery menu.
It will load the eboot at ms0:/seplugins/EBOOT.PBP
note: XMB can be launched from irshell with no problem.