Actually I felt there's some value in the digital zoom, if in fact it does do cropping and not interpolation. THen there's not much image quality difference between digital zooming and cropping in PS. Since both employ cropping(assuming A2 does that). Assuming you only want say a 3-4mp image.
And advantages of zooming while u shoot is that u can see the exact framing as you want it, whereas in PS, you hafta roughly just get an image first...and see how you can crop it later.
Hmm...do let me know if i'm wrong? I dun own an A2 tho.