I realise TeSSH isn't your priority right now, but...
...it would be handy to (selectively) import my PuTTY sessions into TeSSH. Obviously not all the settings will be importable, but the major things (host, port, protocol, name (title), username, etc. should be easily importable as they (and all other PuTTY settings) are stored in the Windows Registry.
If you can point me to a link where the file format of PuTTY sessions is defined, then I can look into this.
Edited: Nevermind, I missed the part of your post where you said it was all stored in the registry. That shouldn't be hard to do.