Lock / Unlock Files
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In the preferences, WebInterface, you can create a custom form. You can have additional fields, but the critical item is a combobox with the specific name "crushftp_locked_user" as this is what is specifically tied to locking, But we give you freedom to design other aspects of the form. You should have two values in this combobox...a blank top one, and a second one with {user_name}.

Then in the User Manager, WebInterface section, buttons section, you add a button for "Set Meta Info" and use a name like "Lock / Unlock". It will pre-populate the command, but adjust it to something like:

javascript:setMetaInfo({customFormToUse:'checkout', noKeyValPairFields:'true', formBeforeKeyValPair:'false'});

The word "checkout" here refers to the name of the form you created in the prefs. Now you have your form to display, and its attached to a button action.

The last aspect is optional, but you may want to display the currently locked user in another column in the WebInterface. For this, in he User Manager, WebInterface section, customizations...filter on 'meta'. Then fill in the three fields with something like:

Where 5 is the column number to use for this info.

The second aspect you were looking for is the History of a file. The User Manager has a button for "Show History" now which will sit off the older revisions that are stored for changes that were made to the file.