Klaus, no worries. I appreciate your trying. Ben did seem to explain in a way that makes sense to me. It still s*cks that cutting or deleting a single frame is no where near as easy in iMove as it is in the QT Player. Btw, the A/B scrubbers I'm talking about are detailed in iMovie's help section. Perhaps I used the wrong term for them, maybe "crop markers" are the correct term. (copied & pasted exactly below):
To select part of a clip:
Select the clip by clicking it in the Clips pane, clip viewer, or timeline viewer.
Drag the playhead (A, shown above) to where you want your selection to begin.
Place your pointer (B, shown above) just below the playhead, and then drag to the right to include the footage you want to select.
The gold portion of the scrubber bar (shown below) highlights the footage you've selected.
To precisely adjust the length of your selection, click a crop marker (shown below) to select it, and then press the Left or Right Arrow key to move the crop marker one frame at a time. To move the marker in ten-frame increments, hold down the Shift key while pressing the arrow key.
iMac G4/1.25GHz Mac OS X (10.4.8) 1.5GB RAM