You could align cursors with the waveform visually if the waveform were repetitive or you could use the persistence of the phosphor (P7 would remain visible for about 20 seconds in a dark room or with a hood). What I intended to say was that cursors could not 'ride ' on the waveforms as they do in a digitical scope because the scope did not retain the waveform. Having cursors move on the waveform avoids visual alignment errors that can happen with simple overlaid cursors.
Could you use persistence to display the waveforms longer, maybe even with whough time to place your cursors?
The first cursors were horizontal and vertical lines superimposed on the display that you could use to measure the amplitude and time differences of points on the waveform. Cursors couldn't do more on an analog oscilloscope since the waveforms were transient -- they only existed for the duration of the sweep.