You may just change starting capital from say 100k to 200k to simulate 2:1 margin in a 100k account and this would allow the same trades.
BUT: all the system statistics are wrong: Profit Percent, DrawDown Percent, and so on
(because they are based on starting capital/current capital)
In overall system evaluation it makes a BIG difference to allow for a specific (ex. 2:1 for IB) margin.
Our Trading System at C2: Topaz