Yeap. Always advisable to add categories manually because its good though it takes some time but you'll get good benefit in long run for sure IMO. DON.
I don't think that there is a dump available for the latest version, But it is strongly recommended that you keep the category structure unique and add value to the directory.
I have the categories dump for phpld 3.3 and I can install them for you for only 10 USD/directory. PM everyone who is interested! Thank you! nethelp/robert
I also agree, I learned the hard way, I build a category list myself on one site, and on another directory I used the category dump and my manually made site had a better result at the end.