The receiver would be able to handle 4 satellites without a problem (you would need a DPP44 installed), but there would be no benefit. The picture quality is the same on eastern arc and western arc, and adding 72.7 to your current setup doesn't add any channels (since all CA locals are on WA). This is all assuming you have 119/110/129
I had a wing dish on 61.5, since I was mixed arc before getting a 1000.2 for a full WA, since my locals are on 129. I have recently moved that wing dish to 72.7, and it sure came in handy during the 129 outage the other night, my system was pulling all my 129 national HD from 72.7 and I have an antenna to get HD locals OTA, so even though my HD sat locals were out I was missing nothing!
I did the same thing during the 129 outage - repointed a 61.5 dish to 72.7 for redundancy. Should have thought of that sooner! It may make no difference when all W.A. sats are working properly, but when they aren't... priceless!