The 'extra fields' can be customised per category but you only get six 'extra fields' for an which isn't much.
Radio buttons, checklist boxes, text fields, etc are in my opinion desperately needed in PhotoPost Classifieds and ReviewPost.
In terms of the different templates that are currently available it's much centred around for sale adverts for goods. I would like to use the application to say sell services. In 'service' type ads there's no need for 'condition' of product and highest bid, etc but I am not very good when it comes to hacking the template files. If I did the likelyhood of having to hack them all over again when the next version of Classifieds comes out is high.
It would be great if the develiopers could please prioritise spend some quality time on improving Classifieds and bringing it up to the same standards as PhotoPost and ReviewPost. Many people on these forums feel that Calssifieds is the poor neglected little brother.