Hi,
sorry for the delay, I had promised that some time ago, but my friends, who wrote the patch, where really busy with tasks of higher priorities before they where able to check-read their patches.
To enable ssh forwarding (connecting to the ssh agent) on x2go it takes two patch sets, one for libssh and one for x2go. You can download them from
http://www.danisch.de/tmp/libssh_0.7.3_AUTH-AGENT.diff
http://www.danisch.de/tmp/x2goclient_4.0.5.1-1-AUTH-AGENT.diff
regards
Hadmut