Yes longer arms would be one way! Failing that you can use the 'save on trigger' (SOT) function. Every time the scope triggers the captured waveform will be saved to a file on the harddisk. To enable this function you need to go to Settings|Trigger and tick on the 'Save on trigger' box.
When you finish your SOT session you will have a bunch of .psd files, if you open the first one manually with File|Open you can then browse through the rest using the 'Page Up' and 'Page down' keys on your keyboard.