TBH there is no definative answer to the question of enabling AV-in on a camcorder.
Due to newish EU rules camcorder makers have to make sure their new cams can not be enabled or they stand to be charged higher taxes on them as they are rated as being a VCR and not a camcorder.
Many older camcorders can be enabled, but some can only be enabled for DV-in while some others can be enabled for both DV & AV-in (AV-in is required for connecting a bullet cam).
A good site for checking the abbility of your cam to be converted is
www.smartdv.co.uk
Mark.