I have been searching around and do not see much mention of multi-leg orders for options.  I believe this is rather important for all strategies with short legs and allowing for proper margin calculations.  Is this possible or am I missing it?

In live trading with IB, do the margins get calculated against current positions...meaning will it recogonize the short leg as a naked position or correctly as a leg?  It is easy enough for backtesting, but it seems proplematic looking ahead at live trading as previous brokers I've used will only properly calculate if submitted as a single order.  IB appears to support four legs directly on TWS.

Adding index options is currently listed as feature request and this ability is essential for trading index options where the requirements easily get in the millions if not properly calculated.  But curious to ask all this in case my expectations are incorrect.