I just figured that Qt Creator is now packaging every Maemo application whenever you tell it to run one. This might be annoying if packaging fails and will in any case slow down the whole process of debugging. However, if you want to skip the packaging step, this is not an option in Qt Creator 2.0(!).
Luckily the Qt developers over at Nokia are aware of this and have released a fix in the latest builds of Qt Creator. To acquire these, go to Qt’s snapshot homepage or just download the 32-bit or 64-bit versions for Linux directly from the build made on 12th of July.
Now you may select to skip the packaging by editing the build steps in Qt Creator.
Be aware that the snapshot versions are in development and may have bugs causing irrevocable data loss. That’s the risk you’ve got to take these days to avoid those bloated packages.