Yet Another Sync Option (Y.A.S.O.) - Opera version. Yes, I do mean the note function built into the Opera browser, accessible through my.opera.com's 'Opera Link'. Before I discovered CintaNotes, that is what I used. Easy, always open, always accessible. Figured it was past time someone suggested it.

Add menu item 'Edit Ext.' , to export selected note contents to user defined editor (such as Sublime Text, WriteMonkey, Notepad ++, Q10, etc). Not intended to replace default editor, or the regular export. Simply a way to streamline the process when you need a little more power. 

For handling, I'm thinking that CN could save the note as a temporary text file with a randomly generated name and open it with the external editor. Lock the note but watch the file for changes, so saved data gets imported straight back into CN. When the external editor is closed, import the last changes, delete the file and unlock the note.

Or every note could be backed up with a text file by default, allowing the external editor to reopen the notes directly. And cause incredible bloat...