IB has a system that automatically warns you if your trade is going out of certain parameters, and therefore asks you if you really want to place the trade. I would like to suggest that IB also has an automatic "are you sure you really want to place this trade" for the event that placing such a trade will cause other order(s) to be cancelled (i.e. due to coming to the maximum of available buying power). This would be very helpful, as we usually have a long list of outstanding trigger orders, and it happens that once a month or so we lose all of our orders. This goes without saying cancellation charges and losing our place in line.