System Information
Win7 x64 Premium 32gb, i5 6600, 2x 970 GTX 2gb
Blender Version
Broken: 2.77 22a2853
While in pose mode is half of the "Add" menu disabled from being added to the scene, and I can't see a real reason for that as even meshes added at that time aren't seeming to get different conditions, like being already set to use the armature or something.
So I'm wondering why so many things are disabled for adding making you have to leave pose mode, or select something else which is in object mode, to be able to add an empty for example.