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Percent of Volume in Backtests?

Hi All,

I am trying to backtest a strategy that would be live-traded using a VWAP Best Effort order type, with a fairly passive max_pct_vol setting (low liquidity securities, don't want to push the price around).

Is there any backtesting parameter that I can set which will limit the simulated fills to only a certain percent of market volume during that time? I tried using style=VWAPBestEffort() with a max percentage set, but from looking at the simulated fills, it seems that the engine is assuming all volume in that bar to match my order.

Thanks in advance