The behaviour of pending orders could be covered better in the manual.
Zorro is not putting a pending order as we would expect it from manual trading.

I also do have a lot of questions regarding pending orders.
Important would be to know how the tool handles orders in general, specificly in a portfolio loop (sequential and waiting for confirmation, or just fire all orders within the loop, collect the confirmation after, and maybe if no trade open, fire again?)

Basically blocking vs. non-blocking design?