ScopeHunter is a plugin I wrote that you can configure to put the scope of what is under the cursor into your clipboard (it also can show you a lot of other stuff, but you configure it how you want it to work). So you can use that to quickly get the scope into your clipboard, then you can open up the scheme editor.
The tool and the plugin don’t really communicate right now, so simply sending the editor process something to search for isn’t possible at this time. I do plan on adding a search option, and who knows, maybe I will implement some kind of communication between the plugin and the editor down the road. I might also implement importing undefined scopes into a theme at a later date as well. I just have to wait till I have time to explore more options. Right now I just want to get the basic stuff down, and get it to a stable release.