Well, music is music, I don't think being a 'bedroom' composer or being a 'professional' composer really matters, when I think about it.
It's not a matter of your status, it's how good your music is. :P
Most of the latest games have sound systems that can play more then 64 sounds, and as Half-Life IS one of those latest games, and the fact it's a FPS - all factors point to yes.
Who is this prick?
Even if he is who he said he is... I really didn't know that warner brothers employed five year olds.
In otherwords, post were someone will acually give a shit about what you say.