I can't find a way to disable parallell execution for individual projects. This should be an option under configuration.
We have both integration and unit tests in the solution.
The correct way to do this is to specify ExclusivelyUsesAttribute at assembly level of the test projects you wish to disable parallel execution on.
Simply specify it with an arbitrary value, i.e. [assembly:NCrunch.Framework.ExclusivelyUses("TestRunner")]
All tests within these projects will then be marked as making exclusive use of the "TestRunner" resource, and will not run in parallel with each other.