@xehpuk: I've documented that opening tunneled sessions is not possible from the Login dialog, if that's what you were missing:
https://winscp.net/eng/docs/ui_login#opening_in_putty
(Bug 2116 didn't change that. It was never possible).
https://winscp.net/eng/docs/ui_login#opening_in_putty
(Bug 2116 didn't change that. It was never possible).