sqiddster, no, localvalue wasn't on that list! It's only the get key at expressions, which take an integer index rather than the key names, that are blocked. To clarify, the following ACEs work on the arcade:
Local key exists
Session key exists
Set local value
Set session value
Remove local value
Remove session value
LocalValue (get local value)
SessionValue (get session value)
The following are blocked:
Clear local storage
Clear session storage
LocalCount (number of local values)
SessionCount (number of session values)
LocalAt (Nth local value)
SessionAt (Nth session value)
LocalKeyAt (Nth local key)
SessionKeyAt (Nth session key)
The latter can also be worked around if necessary, but with a lot to do that build I thought I'd just get the basics out in time for the competition. You can still save and load values. The blocked stuff, without some extra work, would allow using and modifying other game's data, since they work with the global list of all saved data. That's why for the time being they're not allowed. Do you urgently need any of those other features?