This has many potential uses for the classroom and here are my suggestions so far.
I have two service bells in my classroom (I got them from the game Yes! No! which is relatively cheap). Input 12 items of vocab from the lesson into decide now. One player from each team comes to the front and has a bell. Spin the wheel, first to ding and translate when it stops wins a point.
All students choose one of the vocab items, write it on a scrap of paper and stand behind their desk. Spin the wheel and any who have the same as the wheel remain standing. The students still standing choose again. Repeat the process until you have a winner.
Choose a card
Create a set of flashcards to match the vocab on decide now and pin these around the room. Students choose which card to stand near and you spin the wheel. If the word they have chosen appears, then they are out.
For a different take on a carousel lesson where you have 5 or 6 tasks prepared for the lesson, you could enter the tasks on decide now! and spin the determine the order students work through them.
To introduce new vocabulary, you could enter the new words on decide now!, spin the wheel and students have to race to find the meaning in the dictionary. The first to hold the meaning up on their whiteboard wins a point. The wheel may well land on a word which has already been looked up, so the first to shout out/re-write the meaning wins a point and so allowing for re-enforcement.
We play pictionary a lot in class with students competing to draw the item fastest on their mini whiteboard. I'm don't, however, always prepare the items well beforehand and so a spin on decide now! could determine what they have to draw.
Talk for a minute
Thanks to Amanda salt (@amandasalt) for this suggestion. Enter topic areas and students have to talk for a minute on the topic chosen.
Strip bingo was suggested by someone on the TES collection of MFL games but apologies as I do not know their name. The idea of strip bingo is that students have 5 boxes in a line and fill each with an item of vocab. They have to tear off each box from the outside working inwards as the items get called. The winner is the person who gets their final box called first. This is more effective than normal bingo as it means the vocab has to be called more than once (a player might have a word on the outside and tear it off immediately but another player may not need the same word until their last square). Decide now! would be a good way to select the vocabulary.