Usopp says in Mangastream that he managed to "put almost all of [the Weatherian devices] in there, save for one. The magic wand you told me about on Sabaody...I couldn't really wrap my head around it", and Nami's flashback bubble said "It's a magic wand!" This made it sound like she gave him a wand that he couldn't figure out how to include. VIZ phrases it: "I implemented all of the Weatheria devices that you gave to me. The only thing is, I don't know what you meant on Sabaody when you said you wanted a magic wand, so that'll...depend on you?" (The "depend on you" part is in his speech bubble in the next panel, instead of "What have I unleashed?"), and Nami says "Just like a magic wand", so I think she was really saying that there was something else she wanted the Clima-Tact to be able to do, rather than another device she wanted Usopp to include.