It would be a great feature to have Extras (e.g. pedals etc) that track inventory levels. In other words, they would behave like extras - in that they are added to other inventory, but they would also track inventory levels.
This is very helpful especially in road bike rental. At the moment we have three times as many road bike pedals as necessary.
This would be great some extras are limited so its possible to overbook them.
We are having the same problem. Options being overbooked.