Not so much more airports, as much as better quality. Many good feeds are simply down. Being down for a couple hours for service is one thing. Good airports seem to be down for long periods. Some things can't be helped. The status forum is great.
The one I would really like to listen to is KONT/KLAX. I simply can't deal with the audio quality. Background noise, hum, weak signals, over modulation, etc... This makes the feed almost unusable. The KSNA feed is a good example of high quality audio.
Quality aside, between the KONT, KSNA, and KSAN feeds. SoCal is covered. Can't beat that! In fact, I can't think of a region better covered.