[Armin]

The Dungeon Fantasy RPG.gdf file has a tiny list of modifiers, to support only the things specifically mentioned in the box, but not including much at all related to equipment.

So, intentional, but also probably incomplete, and not an issue specific to you. If you want the option to create new modifiers, you'll need to import that from elsewhere into your data set (or it might be in the equipment file, I dunno).

I'll hunt down the link to Emily's equipment file and download it again soon, no need for you to bother with it.