It is still not clear to me what is the problem... If you can run ssh from remA, just ssh to remB and run the commands you need there. You will need to add option -t to your ssh commands in order to allocate a pseudo tty, so that passwords are requested. For instance: 
$ ssh -t remA ssh remB

[download]

Anyway, reenabling ssh tunnels just for you is possible and not so tricky. All you need to do is to run another sshd with your own configuration in remA through another ssh connection:

Copy /etc/ssh/sshd_config to your home and edit it enabling tunnels. Create a new set of dsa and rsa host keys on your home and set the paths on the configuration file accordingly.

And then... 

$ ssh remA -L... -R... -o 'ProxyCommand ssh remA sshd -i -f /your/home
+/your_sshd_config' remA-foo

[download]

In reply to Re^3: Why I'm Populating authorized_keys with Expect by salva
in thread Populating authorized_keys with Expect by cmv

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