Add force-probe-execution for a specific probe

It would be nice if qbs users could specify force-probe-execution for a specific probe in the qbs file. I have a module that queries git, using a Probe, for the current version of the application. When I make a commit in git, the version changes, and qbs doesn't re-run the Probe even though version has changed. It would be nice if my git Probe would always execute. Also, Qt 4.0.3 doesn't have an option to run --force-probe-execution.