Glad you are enjoying the KBFI feed that I am providing. It's good listening, and surprisingly popular!
I'm not able to pick up most aircraft on the ground from my location, so adding the ground frequency doesn't help much. I do pick up most of the ground controller transmissions to aircraft on the ground because most of the time the single controller transmits simultaneously on all frequencies.
I did try to add approach and departure control, but it doesn't work too well. Those frequencies serve SeaTac as well, so most of the conversation is dominated by SeaTac traffic. Also, much of that traffic is pretty far from the airport and difficult to receive.
I'm thinking about adding a better antenna to see if I can pull in more. Keep listening!
Steve
PS. Based on your location, I'd bet you could pull in some interesting frequencies such as the Lake Union traffic, the Kenmore Air Dispatch, Flight Watch, and Seattle Radio. Perhaps you could be a feeder too!