odf, Two things to consider with the cr2 for the BBEyes. These things are not directly related to injecting the eyes, but apply even it they are built into the cr2. One; if an eye is scaled, the cover will remain the same size, this will also happen if the HeadGrow dial is used. It may be a good idea to change the scale channels in the eyes to 'propagatingScale' (as used in the BODY) so that the cover will scale up when the eye is scaled. Two; when trying to select an eye with the cursor, it is inevitable that sometimes the EyeCover will be selected instead of the eye. To overcome this problem it may be a good idea to hide (this is not the same as "Visible" ('off')) the EyeCover actor, as this will prevent it from being selected via the cursor.

actor rEyeCover:1
        { 
        name RightEyeCover
        on 
        bend 1
        dynamicsLock 0
        <span style="color:rgb(0,255,0);">hidden 1</span>

Another consequence of hiding an actor is that it will not show up in the 'Body Parts' drop-down menu. However it will still be selectable via the Hierarchy Editor, and be amenable to pose files.