bricks is a GTK+3 GUI tool, written in Python, that permits to manage the "feature meta-packages" provided by Semplice since Semplice 4.
A feature meta-package depends on the packages that provide the function. To "enable" a feature, that package is installed. Instead, to "disable" one, the feature meta-package and its dependencies are removed.
bricks.engine is the library that interfaces with python-apt.
Just edit features.py (features dictionary). Then add the feature on the features_order tuple.