Purchased Alfred today after much ado! Tinkering around with workflows is quite a bit of fun.
This is just a simple thing as I could not find a workflow that did this already, I retooled a python script from https://gist.github.com/fredrikw/4078034 (thanks to a suggestion from another user) to make a very simple media controller command for a mac with media keys.
Find it here: https://github.com/beauwilliams/Alfred-System-Media-Controller
Note: it needs some revision to add autocomplete options etc, but I will have to find some time later to revise.
Any feedback for now is appreciated! Enjoy