So just brain storming this, I would add some sort of additional column in my table that is something like session ID or batch ID to identify all the records as being part of the same effort. This introduces a concept by which you can do work on the records as a group instead of treating them as individual records.

For the new adds to the editable list, you can us a for condition to loop through the new records in the list and save them to your data source. Your action to start the workflow would be outside of that loop so it would happen once when the loop finished. You would be sure and pass that session ID into the process.

Before the loop you can make some sort of call to a session table, where you can do a create single record with something like user id, date time and maybe process id where you can do an insert before you start the loop to get a unique value to use as the session ID. Also, you can later have the process update that table with the process id to give you some traceability with reporting matching up records to process.

Hope this spurs some thought, Let me know if you want me to clarify any of that I realize this was a pretty high level run through, but what you are wanting to accomplish is very doable.

S.