By default, each project's build configuration (Build Steps) does not enable the "Stage for installation" checkbox.  In our build process we pretty much always want to perform this step as part of our build.

The builds are via cmake-based projects, and the actual "Staging directory" is configured in the cmake files themselves (via `CMAKE_INSTALL_PREFIX`).  The value given to "Build Steps"/"Staging directory" actually ends up being prefixed onto this, so we clear this field completely.  Thus, specifying the default value for this field would be desirable, too (supporting Qt Creator variables, ideally).

I admit, this may be specific/niche