If I understand you correctly, you want to do the same things I do every day. I have a number of web site customers and I regularly need to FTP upload/download to their individual sites. Instead of the way you are asking for, what I do is to set up a saved layout for each of my customers. To do that, here is what I do:
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Put Opus in dual pane mode.
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In the left pane manually browse to the offline folder for the customer I want.
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In the right pane, log into the FTP server for that customer.
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Set my displays to sort the way I want them (I sort by last modified date so the newest files are at the top of the list).
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Then go to PREFERENCES/LAYOUT/SAVED LAYOUTS and save your settings with your customer's name.
That's it. Then the next time you want to connect to that customers web site, just go to PREFERENCES/LAYOUT/SAVED LAYOUTS and load that saved layout. Opus should then switch to dual pane mode with your offline folder loaded in the left pane, and it should automatically log into the FTP site for that client. And everything should be sorted the way you want it.