The solution would be implementing a per-asset price offset. In fact it is already implemented - g->vAssetOffset - but currently undocumented and for a different purpose. I'll check if it can be modified for dealing with negative prices. This is no optimal solution, but would guarantee backwards compatibility.
This would be helpful. Thanks.
Earlier, I tried to download from the $TICK symbol via the TradeStation plugin using the Download script, but Zorro immediately complained about invalid prices/ticks.
