You can add a side sat dish to your eastern arc for either 110 or 119 and you can still get distants. I did it for hd distants last year , when I tried out AAD . Proved to costly for my taste , but the picture quality was great for L.A. distants.
Yes, any 4 satellites can be added with a DPP44 switch. Although the 61.5/72.7 combination takes care of all national programming, you may only need 110/119 or 129 if your locals are there.