@marcdk connect over ssh and type:
/etc/init.d/S31emulationstation stop
Use start instead to start it again.

@substring
substring, if you could lock it down completely I would. I don't think you would find many complaining if you did.
Yes, people (myself included!) come on here and have a moan every now and then, but we'd never rip off all the hard work that's been done.
The ebay sellers clearly have no shame or conscience..