Any iProp can be attached as accessory in iC6 saved and renamed to the Crazytalk8 accessory CtiAccessory file extension, you just cannot edit or remove them once attached (unless edit undo or arrow back right away) even spring bones and animated props work.
From another thread
wendyluvscatz (3/9/2016)
yes you can import FBX accessories with spring and animation too
you cannot edit them in Crazytalk if in wrong position or retexture but if you set them up in iClone they will load to the body part in place
I even added a building which is iClone marketplace DRM protected content not externally exportable but still useable in CT and imported animated DAZ figures attached to Christian's root node and saved as an iAcc renamed ctiAccessoy here