Nitro,
So IB allows conversion or what? I don't see how it could be too risky to enter the conversion manually if you do it before the stock start moving . Again here I don't know if it would make sense to do this in real life trading but say you are pretty sure a stock is heading down in the next couple of days and has a large range(tends to fall off a cliff at the open instead of gapping down huge) but you don't want to take an outright short position, instead of buying puts or do a bear spread you could put a conversion on and sell the stock if it sinks at the open, usually it's almost impossible to get short in time when that happens.
Is this doable?
Yes!
_BUT_, here is the minus, and why you want to do this from a prop firm. First, you have to understand that the margin requirements for having a conversion on at a retail firm are calculated "the retail" way. You see, since you are legging into a "complex" option position, their systems do not know that the position is "riskless." Therefore, you margin requirements, even for a conversion that allows you to short 100 shares of stock, will be several thousand dollars, EVEN THOUGH THE POSITION CAN"T LOOSE OR WIN MONEY AFTER IT IS PUT ON (other than whatever loss you "locked in" because of the bid/ask spread on the options, and stock.)
At a prop firm, they understand that, and your "buying" power isn't affected whatsoever! Not only that, they are done as one position, making them much cheaper and faster.
HOWEVER, IF you have a properly funded account, and you are able to put these things on CAREFULLY, and you start out by doing a SMALL conversion, and you want to be able to SHORT a stock at WILL, then go for it.
I am amazed when people on this board learn a technique and don't want to experiment on their own by simply trying it on small lot(s.) Just do it and see what happens. Don't get flustered - just understand the "position" isn't on until three trades have been made.
If you have never put on a conversion, and you have never seen a neutral position, watching your P/L as the stock and two options trade is a real treat - it will put a smile on your face, and more importantly, it will give you a deeper understanding of one of the most fundamental techniques of the professional trader.
nitro