The volumetric flask configurator is completely non-functional on version 1.7.05.67 of GT++ (GTNH .9.0 RC1).
I can't type a custom setting, if I put a volumetric flask in its capacity doesn't change, if I insert flasks automatically (after configuring with a screwdriver) they are put into slot 0 anyways, and I can't auto-extract from it.