Just as SSH command invocation can be modified with --as option to set a user name, it would be utterly useful to have the ability to specify different ports to contact ssh daemon. This may be required (as is my case) when the machines where jobs are to be run are behind firewalls.
I think the logical step would be to add generic SSH (and possibly other rsh-like commands) options where "--port" could fit.
Thanks for your comment.
It supports exactly what you described.
Here is how you can configure ssh so it uses port 2222 instead of the default.
gxpc rsh ssh "ssh -p 2222 -o 'StrictHostKeyChecking no' -o 'PreferredAuthentications hostbased,publickey' -A %target% %cmd%"
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Some more general tips:
gxpc help rsh
gives you help on how to use this in general.
gxpc rsh ssh
shows you how gxp is currently configured when you use ssh to explore some nodes.
gxcp rsh ssh WHATEVER
changes this to WHATEVER.
Hope this is useful for you.