Edit page in Files Tab

[bigthanks]

Most people tend to not place these kind of files in the files section (what's the purpose?). More something for a plugin, I think.

Right !, this is for plugin data (but not gs plugins).
For example, now I plan to making several quiz page's using https://github.com/UrbanInstitute/quick-quiz, this quiz is very nice. Because my php and javascript skills is big zero, I apply them in GS by special pages and running well. Json data is stored in files, currently I can edit via ftp+notepad++ but if GS has the edit plain feature on the files folder that's more easy and fast.
I think this feature could be applicable to other plugins.