Just as we have abilty to close a partial postion, would like to be able to add contracts to an open trade. This would allow tranching in over a period of time, or buying more at a discount, or adding to a winner (whatever the case may be)- all while re-using the same strikes making the position eaiser to manage and reducing strike conflicts.

In automation this could be a 'add contracts now' to go with 'close trade now', in backtesting this could be paired with profit actions (ability to set if an action buys or sells). There are already workarounds to backtest this type of strategy - I would think just adding ablity to manually add-to with automation would get lions share of benifits.