Toby BinhQuang Nice work! This is in fact something that we plan to have in core – feel free to integrate it and send
I have made a quick test (first time I am doing something like that). 80% of the time was installing bower and gulp on Windows and understand how to compile js.
After that, the first test was fairly simple. I have placed the command in Appearance page, because there is no page which makes sense, and presently in this page I have the SMTP configure command. Works fine.
I don't think I have the skills to make the full job, but perhaps you can finish my work as before , @santiagobiali ?
If you think it's worth a try, I can share what I have done. Tell me the best way for you.
The main question is design : No existing page is good for Smtp. I think an Advanced page should be added. And inside it, keep the popup or make the fields directly available ? I would suggest the first option, to keep place for other items.
I have tried to add a page, but it is not working presently.