OK, I got a solution:
I set up a "telnet+ftp" to "SSH" proxy at home, then I will be able to connect to SSH servers (for example at SSH servers where i'm not root, and not able to install a telnet server) via telnet, and transfer files via FTP...

Without it, it does not make sense to use SSH at all. You have no security then.

Why not make it possible to turn off these annoying dialogs:
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They are VERY annoying if I connect to load balanced SSH servers, where the server's load balancing is based on routing and not DNS.

Then that dialog pop up every connection.... PLEASE, add the checkbox "Never show this again"....
(and possibly to reset the "never show this again"-memory by a button in settings)