Async test request

[caiogrc]

At the Developer Console, there is 2 possible ways to runs the tests: synch and async.
To choose between them, there is a flag on Test option:

When I try (at the developer console) run without select this option, I got an error:

If I select the option, everything runs fine.
Now going to ForceCode, when I run the test from a class I got the same error as when I try to run synchronous test:

I would like to have some sort of configuration where I can do a similar functionality (flag the option) on ForceCode.
Some settings.json configuration would be awsome!

Hope to get some answer. You guy have an awsome product here.
Thank you!