In the context of Hedge mode = 6, tradeUpdatePool() will enter and exit positions.

I would like a special flag that causes tradeUpdatePool() to only close positions.

Obvious use case:
1) Hedge mode is 6.
2) Have hundreds of positions open, and margin is maxed out.
3) Need to change portfolio. Call enterLong and exitLong for multiple algos and assets. (Pool trades are not affected yet.)
4) Reduce positions in order to free up margin by calling modified tradeUpdatePool().
5) Wait for margin to free up.
6) Call tradeUpdatePool() again, but this time to open positions.