We just released an updated version of the Lock Views Command. You can now have different view scales in the two locked views, so that you can have one view showing a large area of the project and a second view showing a small detail. This way, you can pan around in the large project while showing the highlighted area in small detail - perfect for those edits of small detail like
Trimming off small ends of lines
Joining PDF lines using CAD Grips
Breaking or joining lines where you need to see what the ends are doing before joining
It always amazes me how a small change to a command can make it so much more productive in different situations.