Yes, you may have more than one item pack.
All you need to do is download the item packs you want, place all the files into the items folder, and then merge the content of all the items.cfg files into 1 main items.cfg.
Meaning, you pick the one that you want to be the main one, open it, then open the others, and copy/paste their content into the first one.
A word of warning though, items ingame appear according to install.
For example, if I installed an items pack of Swords, and then Ringo/Delay's item pack, whereas you installed Ringo/Delay's pack first, if I put on the first item on my list, it'd be one of Ringo/Delay's items for you, but a sword for me. It goes by list-order, not mesh name (like it probably should though..huhuhu.)
Hope that made sense. xD