J-ClassifiedsManager - Display elements or not

I have some weird needs for this software. (jclassifieds)
Can anyone tell me how to deal with any of the items mentioned below? technical solutions are welcome as well as any that can be accomplished with configuration.

1 I don't want to use categories, a single default category would be good. types will be enough to use
2- users will be persons only never businesses
3- Canadian dollar should be default.