Lapo Calamandrei does a fantastic work in GTK theme for 3.14, Carlos Garnacho does the touch screen support and Matthias Clasen does all the rest, showing special care for GTK+ Inspector. Obviously more people are patching GTK!
The last 24hrs we have four new things from Matthias regarding GtkInspector.
Touch screen simulation can be enabled by command line too
Matthias added a new flag that has the same effect as the GTK_TEST_TOUCHSCREEN environment variable, but can be toggled at runtime.
For scaling windows from command line (ie factor 2)
Inspector is part of GTK+ 3.14, so if you have GNOME 3.14 you have it pre-installed. To launch it
B. Command Line