I just finished a live game of RB Press, and I agree with CNote. The lack of a Save button was annoying, and I believe, unnecessary. The only reasoning behind removing it that I can see is that there's no press to wait for, and thus change your moves about. However, there are other reasons behind the save button. Especially in Live games, being able to control the length of the phase is useful. Such as when you need to use the washroom... I'm sure even with the save button, retreat and build phases still will progress faster, from the lack of press.
Also, you still can save, and not ready your retreats/builds, if you Ready, then Not Ready. Only works if the other's haven't readied yet, though.