Lock release timeframe vs features

I'd love the ability to lock a release's start and finish date, and its children features have to stay within those dates. If they don't provide some kind of feedback or alert that the feature has strayed out of its bounds. 

Also, in the Releases gantt view, it's too easy to move a release's dates when moving the features around. I love that the release can move with them, but in some cases i specifically don't want that. So add an option to lock the release dates and constrain features within those dates.