Calculating 3 lowest and 3 highest voted values into a new text box

Sure, it's possible. Put all the values in an array, sort it (using a custom sort function), and then get the bottom three items from it for the lowest results (indices 0,1,2) and the top three items for the highest results (arrLength-1, arrLength-2, arrLength-3).

To make a scheme like this work it's helpful to have both an easy way to connect the fields to the topic they represent, and to able to deal with the working fields as a group.  

For the grouping part, the field names are important, the "Score" fields all follow a pattern which will work, i.e. they are all prefixed with "Score-". It would be better if they were prefixed with "Score.", but just having a consistent pattern is good.

The topic will be assumed to be the tooltip for each Score field, which hasn't been filled out yet. In JavaScript the tooltip is the "userName" property.

Here's a script that will sort out the top 3 scores and place the topic text into the "Highest Scores" field.

Place it in the "Highest Scores" custom calculation script. 

To make this script work

1) put a topic description into the tooltip text for each "Score-" field.

2) Make sure all of the radio buttons work for setting the "Score-" field value.

// First collect all of the "Score-" fields into an array
var strFldName, aScoreFlds = [];
for(var i=0;i<this.numFields;i++)
{
    strFldName = this.getNthFieldName(i);
    if(strFldName.indexOf("Score-") == 0)
        aScoreFlds.push(this.getField(strFldName));
}
// Now sort fields from highest to lowest
aScoreFlds.sort(function(a,b){return b.value - a.value;});
// Extract topic text for top 3 entries
var aTop3 = aScoreFlds.slice(0,3).map(function(a){return a.userName;});
// Display in field
event.value = aTop3.join("\n");

Here's a script that will sort out the lowest 3 scores

Place this script into the custom calculation for the "Lowest Scores" field

// First collect all of the "Score-" fields into an array
var strFldName, aScoreFlds = [];
for(var i=0;i<this.numFields;i++)
{
    strFldName = this.getNthFieldName(i);
    if(strFldName.indexOf("Score-") == 0)
        aScoreFlds.push(this.getField(strFldName));
}
// Now sort fields from lowest to highest
aScoreFlds.sort(function(a,b){return a.value - b.value;});
// Extract top 3 entries, which are the lowest scores
var aTop3 = aScoreFlds.slice(0,3).map(function(a){return a.userName;});
// Display in field
event.value = aTop3.reverse().join("\n");