Thanks for the reminder about zeroline trader. I have looked at it before and it did not support the order types that I wanted to use but now my interests have changed and I am going to look at it again.
By the way, I may be misreading your response but it is possible to import a bunch of orders from a text file into the basket feature of TWS and then submit the orders all at once. As far as I know, you cannot use the basket feature with bracket orders, however. Although, as I said, somebody from IB suggested it was possible but I think he (or I) may have misunderstood the question.