a. Which SDK? You mean the ssh client? b. Any custom software is wiped from your account in about an hour, though. Also an SSH re-connect is not that big a deal, IMO. c. There are SSH client Chrome Apps

I guess I still don't see the point but maybe I'm assuming that one is already running a *nix and can either jump into the terminal there or connect a VM in the cloud very easily. The convenience doesn't seem that large.