A feature allowing you to lock entries so accidental changes may not occur so as to protect the integrity of one's data. It would be most helpful if you could lock all entries or a mass quantity of entries at once rather than one at a time.
The Wish List forums are for feature requests in future versions and we typically don't respond here as the support forum is the one for questions. As to the feature suggested in this thread, nothing has been done or is expected along this feature in 1.x series. When we release the 2.x version we expect to support this feature. It is a great idea and shouldn't be too hard to implement.