User Answers

While not truly extending Ens.Util.LookupTable, we have numerous cases where we have to handle multiple values against a single key. 

Our solution was to identify a special character we would use as a delimiter of values (say @ for instance) and store them as such: value1@value2

We then have a custom CoS function that we can use to perform the normal lookup functions that parses the values and returns them as an array object that we can then use to pull out the value we need.