To achieve something like that in Opus, or anything else, you will probably need the command line controls that wake up the scanner, tell it to scan, where to put the file and what to open it with.
The request for command-line control of printers is a regular among users of software like PaperPort, which exists to manage scanned documents. Sadly, no one seems to have tried to fulfil this need.
What about this? Probably worth a test: burrotech.com/quickscan/index.php
If I understood correctly, this tool is made to start scaning from commandline - instead of using some bulky tool.
If that works as described, the rest is a piece of cake! o)