Hello Nicholas!
Good question, If you have your requests to different web services separated into different Runners you can get the request statistic from each runner that would correspond to different web services.
To achieve this with the SoapUI runner you have to have a SoapUI project that only have calls to a single web service on each TestCase. When you then use a TestCase in a SoapUI Runner in LoadUI the runner will only report requests to the corresponding web service. To display "requests per second" statistics from the SoapUI runner just add the Sent -> Per Second statistic to a chart.
There is currently no way of aggregating statistics from different runners, so if you have different runners calling a web service (maybe in different scenarios) there is currently not possible to threat this as one statistic.
Feel free to ask any further questions!
/Max