Yes, this is possible. To do this check the parallel box in the script editor as shown in the image below.
Okay, so by doing that, it runs all tests that are next to eachother with paralelle enabled.
We have all of our interactive tests at the start of the script, and i would like all the system tests to start running the second PCDoctor opens, not when i reach the first time i have a parallele ticked on.
And if i put the system tests after the first interactive, i have to wait for all of them to finish before the next interactive test can begin.