Why can't we use delay timer for dough program with the B & D B6000C?

I just bought a Black and Decker B6000C Breadmaker and the manual says that you can't use the delay timer with the dough program. My question is why? My last B & D breadmaker could do this and I found it very helpful for making pizza dough as it was ready when I got home from work. If I can't do this I'll be taking the machine back to the store and look for another machine that does do this!