A big +1 for including a SFTP account plugin. Many people already use sftp to trasfer data to and from the Jolla (me included) because MTP is more or less totally unusable. Therefore it would only make sense to make it easily available in the GUI - also, it would be really #unlike (and probably also the first mainstream phone having this) and thus fitting with Jollas philosophy.

BTW, most mainstream Linux environments have some sort of GUI for adding SFT mount points or shortcuts (at least Gnome, KDE, XFCE, ...) so yet another reason for including it and making Sailfish OS more normal & usable.