A lot of workflows are made to work with specific applications. It would be great if you add an option to limit workflows actions to work only with indicated apps or to exclude some apps that we don't want WF to work. This brings two main benefits especially for workflows based on hotkeys:
you will not trigger some workflow by incident in other app that is not supposed to work (which could cause some strange behaviours, if for example workflow triggers some others keyboard shortcuts through AppleScript).
you will be able to use same shortcuts in many applications that triggers specific wor