On my VS2012 I noticed that if i edit a file that is not checked out in a notepad and save it, in TFs it will be marked as checked out and edited. So far we haven't found too much of a problem of it, but potentially people can get careless and make/save changes unintended.
Is there anyway to turn off that feature?
What you're seeing is now default behavior for Local Workspaces. One way to 'undo' this is to set your workspace to a server workspace once more. But I suggest you first investigate the benefits of local workspaces before deciding to turn it off. People still have to check in files, so there is a gate between changing the file and actually committing them to source control.
