Minor: This setting reads like it can be automated. If two Zorro instances run strategies for the same API, then it could simply auto enable it, otherwise turn it off. Thus the user would not have to worry.

http://zorro-trader.com/manual/en/mode.htm
Quote:
NOLOCK
Don't synchronize multiple trading Zorro instances. Synchronization prevents simultaneous API access, but freezes all Zorros while a single Zorro waits for a response from the API. Set this flag for speeding up API access when the trading Zorros don't share the same API.