Option to automatically lock a file.

We constantly have issues with conflicted copies! Yes - even though there is the badge that shows up, and even though file locking is an option if done manually. I've done research and MANY other systems support this feature. I've been a long-time Dropbox user, but am looking aggressively at changing due to this issue. It shouldn't have to be a manual process to prevent someone else from opening the same file I am currently working on and saving a conflicted copy. Who would remember to do a manual file lock each and every time they open a document?!