Hmm, that is weird. I was sure that it would work with (T) as System.Object.
Can you please try opening up EasySaveNodes.cs, find the class called EasySave(T) at line #86 and add this attribute just above the class name [AppendListTypes].
Doing that will make the editor also show List types to be chose for (T) and as such allow you to add the exact node type required; in this case EasySave (List<string>).
Please let me know if that would work.
The rest of the graph looks correct by the way.
Gavalakis
