Hi,
It is not easy to modify it quickly, since it does not separate the popular results from the others in the code. So extra checks on the list contents would have to be added for that, i.e. searching for the "popular results" text item and check how many items are in the list under it.
If it was very simply to add I would give it. But it is not something that I can do in 1 minute.
The results of each group are in <ol> lists, with each title in an item <li> if I remember well. So search for the part of the script where it searches for <ol> items.