The feature is going to be included in the next official release Q1 2105.
Importing a document could result in a big UsedCellRange due to the big range of the imported DataValidationRule cell property. The UsedCellRange calculations should ignore this property. This could lead to a performance diminishment when exporting.
The feature will be available in our official release 2015 Q2.
The feature is available in Q3 2014.
Implement Protection feature.