Just an item that can record in game footage and can be bought in the store would be pretty cool as well as providing a way to see what happened to your other teammates if they had one. When a recording is stopped it drops a disk that can be placed in the tv decor and it would play what was recorded. It would be cool if disks could be sold to the company as scrap depending on what happens like if you encounter a monster the value goes up.
When a recording is started it would slowly drain the battery and also would detect any noises that occur including voice chat. I think it would be cool if the recording quality of the item was low as it would add to the experience.
Overall, it would be a fun store item to purchase as it would provide a way to record what happened to you and also provide as a way of selling scrap to the company.