Yeah, File Filters look awesome, but unless I'm missing something I can only bring up a file list that still needs buffering or something to open multiples, I want something a bit more hands-off. I played around more trying to leverage my n00b terminal skills more than Alfred features. The closest I've come so far is a workflow and some grunt work:
A keyword input with the argument of the file name. eg. "findfiles config.rb"
This fires off a terminal command: find . -name '{query}'
The result in terminal is line after line of the files with that explicit file name (I think this could be time consuming eventually). I can then copy / paste this into Sublime. I can then do some "Subl parcour" to add "subl " at the start of each line and " && " at the end of all but the last line. When I paste this new result into the terminal it will open all the files in Sublime (the subl command is a common alias on my system).
Not sure if this can or should be improved - if there ever are thousands of results maybe it's better to get a list in terminal than bog the system down opening files!