It would be very useful to show % changes between individual files and total changes between two directories.
In addition, number of lines changed.
You would then be able to quickly see which files have changed the most.
It would be useful to be able to show these code churn metrics to project managers or customers. They can see how much work you have done in a particular month.
If a new file is added, it would show as 100% different and all lines would be added to the root directory total.
By default, any comments or spaces should be ignored in these calculations.
I am running v 2.12.4 of WinMerge on Windows XP and Windows 7.