Actually that ended up being the solution The only bothersome thing about it is the fact that all of the mapped widgets commit their data when only one of them is changed. It would be excellent to be able to commit only one mapped widget - e.g. submit(QWidget *).

It's not a huge bother to program around that, but it requires tweaking the model and the instant-commit functionality is required basically in all the applications I work on (honestly, I kind of expected that to be the default functionaly).