I have asked a question about saving edited files that need sudo password when we use internal editor (https://winscp.net/forum/viewtopic.php?t=8919)
It seems that current version does not support that. So I thought it may be a good idea to request such feature.
As you know, I can open the file (for example .bashrc) with the internal editor and after edit, save it directly.
But what about if I want to edit /etc/apt/sources.list or other text files that need root password?
Please consider that for next releases.