I often set filter conditions then want to change those filter conditions to a different variable. For example, I'll run an Admissions report on "Expected Enrollment is Full-Time" for the Fall 2015 semester, and once I get that number, I'll run the same report but set Expected Enrollment to "Half-Time". In order to do this I need to delete the Full-Time condition, and add another Expected Enrollment condition.
While it's really just a couple clicks, I think it would be helpful to be able to double-click on the filter condition and change the options for that condition. So rather than deleting and re-creating the condition, I'd double-click on it and change "Full-Time" to "Half-Time"