You should! The cards are great!
Do you mean things missing from the cards? or the pocketfold? I'm not an expert on the pocket fold so forgive me if these ideas are redundant in any way. But for the cards I'd love to see NPC motivations, an adventure prompt string (I'm thinking something along the lines of drawing four cards to fill in the blanks of "A blank sends you to get a blank from the blank and blank is trying to stop you."), location identification and descriptions (in addition to the regular description text), sense prompts (like in the GMAs, smell, sound, sight, touch, taste). For what it's worth I do not like the names on the GMA cards and NEVER use them.