Appending an value in the URL is a pretty good trick. Thanks for pointing that out. I have to agree that an editable variable would be better. Nice.
If i have to customize it in 4.x, then will url appending work as there is jQuey ( i guess). So it seams some plugin needs to be written for same which will override exsting numResult default size.
Did you discuss with your team to make it configurable using System Property ? or is there any future plan to make it property-governed, as this numResults ( which is 30 by default) have been used in the application's different screens to show the contents respectively.