Added 6 things in Part Edit properties, and nothing.
Even in the .fzp file, which you shouldn't have to directly hack, there is no way to discern between an enter-able box and non enter-able box.
<properties> <property name="family">capacitor [bidirectional]</property> <property name="variant">variant 3</property> <property name="part number"></property> <property name="power"></property> <property name="capacitance">100nF</property> <property name="plastic"></property> <property name="package">100 mil [THT, multilayer]</property> <property name="layer"></property> <property name="metal"></property> <property name="colour"></property> <property name="free"></property> <property name="voltage"></property> </properties>