I would find this useful to make sure that I was being consistent with naming conventions and avoiding a sprawl of Data Types.
2. Backup Selection
I think it would be easier if rather (or as an alternative option), you could provide a check-box selection list of items to be exported and allow the user to name the output file
3. Make the Data Types page more like the Data Sources page, where you can see all the types on one screen and select the one to edit from there. This may be a (temporary) alternative to the tree view in ny first suggestion.