http://individuals.interactivebrokers.com/en/general/education/webinars.php?ib_entity=llcQuote from 1Reason:
IB IMHO doesn't do a good job explaining the 10 million things TWS does. You also might as well forget about asking customer service as they don't seem to know either.( I thought you may want to know that before you sign up)
Yes, in the book trader you can change the number of shares. you can type it in or you can click the amount and different amounts will appear that you can click on. aside from not being able to scrawl up or down as much as I want without limit it seems to work better (for me anyway) than the third party tools.
One other point is you can direct the orders to a marketplace. for example NYSE stocks to ARCA etc.... (while you may with the third party tools that connect via API IB charges an API fee if you don't use SMART routing)
http://www.interactivebrokers.com/en/general/education/priorWebinars.php?ib_entity=llc