SSH scanning is only supported for *nix based systems like Linux, Unix, BSD and OS X. Ideally, other network devices are scanned through SNMP (SNMPv1, SNMPv2 or SNMPv3), but data can be pulled from the following protocols as well: FTP, HTTP, HTTPS, JetDirect, SIP, SMTP and Telnet.
There are no immediate plans to expand SSH support. Given everything else that's going on right now (the deployment beta, the help desk alpha), other features have low priority.