Okay, I just got the latest Marine Aquarium Time 2 version from the SereneScreen website and the small problem that I described above is still there.
After importing my .bmp logo, then using Page Up/Page Down and Crtl+Arrows to position my logo perfectly within the crystal, if I continue to press Page Up/Page Down and Crtl+Arrows while the crystal cycles through the clock and calendar, nothing happens to the calendar or clock, but when my logo comes back up, it is all out of whack.
So, my origional wish for some kind of "lock in position" still stands.