Running Gattling in Intellij in a non sbt imported project -- cannot run in Debug

This is quite possibly beyond the scope of a Gatling group, but it’s frustrating to me, since I am new to both scala and Gattling.
In my non sbt imported project, I can run the tests with a mvn clean install or mvn clean test gatling:execute but that’s all.
For debugging It’s be great not only to put breakpoints on a line of code in my .scala files and somehow turn debugging on and have it catch on these.
The plugin hooks into the first scala file directly, and that one calls all other scala files:

via <simulationClass>advanced.WebServicesJenkins</simulationClass>

and

    <jvmArg>-Dgatling.defaultSimulation=advanced.WebServicesJenkins</jvmArg>


 my non sbt imported project, I can run the tests with a mvn clean install or  mvn clean test gatling:execute but that's all.
Is there a debug flag or something that I have to turn in in jmvArgs too?
Thanks,
Mark

Hi,
I am using the following project from github in which I am testing my simulations: https://github.com/bbc/example-gatling-sbt. In Intellij Idea 2016.1, I do not see the test responding to breakpoints in the scala code when run in debugging mode.
Will do some more checking.

Henry