I would urge all to take a look at the course on Trading using R with Interactive Brokers. This will surely answer some of the questions that are being asked in the thread and all the views and counterviews tossed around.
https://gdcdyn.interactivebrokers.com/en/index.php?f=25243
If you are interested in automated trading, you can also the try the Python IBridgePy API. Let me know if you have any issues either using R API or the Python API. I will be able to assist you. Cheers!
For those who are interested in using R for trading on Interactive Brokers there is a nice course listed on their site on "Trader's Academy" page. Here's the link to the page.
https://gdcdyn.interactivebrokers.com/en/index.php?f=25243
The course name is "Trading Using R". Just scroll down on...