It would be great to be able to lock tool settings so that they can not be accidently changed. This could be an individual tool check box setting, but would ideally be a canvas or workflow level setting. Any user should be able to unlock the tools for editing (optionally, this can be a password protected canvas level setting to prevent users from unlocking tools and changing settings unless authorized to do so.)
Assume a large complex workflow needs a change, but the user is not absolutely sure where and needs to review tool settings on a few tools before finding the one they want to change. While doing this, they could accidently change a setting somewhere introducing a new bug. If the tools were locked for editing while reviewing, then unlocked once the correct tool was identified, this scenario would be preventable.