Thanks for the info!
Good to know that the placeholder GTC order works, it's an extra step but easily doable.
TDA is nice as well but it is lacking features and products that I'd need.
I am considering moving to IB with a portfolio margin account.
I understand that in the past there was a problem with the automatic liquidation algorithm of IB, where some of the legs of Euro style credit boxes on an index (SPX for instance) could be automatically closed for risk management...