Its good to have a locking feature by default on the campaigns/workflows/web-apps or any other such activities on the platform which are already in editing mode by an user.
This is something you can do by yourself by adding
lock button to workflow form
add new SOAP method to xtk:workflow schema and in js library
add new field to xtk:workflow table eg. lockedBy where you would store operator id. Each time you press the button it will either lock the workflow or unlock .