In eclipse I can include things like the following in the vm args or program args in a launch configuration:
-Dsome.system.property=${string.prompt:explanation:d
There is no direct equivalent in IntelliJ. To make it easier to share configurations or other project settings between multiple developers, you can use path variables (Settings | Path Variables, see the Help for more information). To customize the options before launching the run configuration, enable the "Before launch | Show Settings" option in the run configuration settings.