Have you tried ExpanDrive for Windows
? On OS X I have been happily using ExpanDrive for some time and would hope their Windows version is just as good. It's not free, which may be off-putting, but there's a 30 day trial.
For what it's worth, I think that adding FTP/SFTP support is a big, big feature and has so much potential to sap resources whilst trying to get it right that I'd personally prefer if jps
spent that time working on other areas of core editor. If I were to guess the biggest barriers to uptake at the moment, I'd go for a) UI for editing preferences etc. b) a friendlier method to install packages and c) documentation. Those are certainly the things that prevent me recommending it to some, less technical, people I know who are looking for a better editor.
P.S. I am not affiliated with ExpanDrive in anyway, in case anyone wondered!