I'd like to add our vote to the push for easier price based strrategies in Zorro.

You guys on the Zorro team seem unconvinced that price-based trading will add to the profitability of users, so have given Renko lower priority.

But like acidburn, we've been playing with Renko and P&F and finding it works very well to filter out the noise caused by time. As acidburn points out, it's not time movements that make profits, but price movements. The time dimension often simply obscures this.

In our tests, indicators and signal processing often work much better on Renko charts, and for building price action algos Renko bar patterns are much clearer and easier to define in code in comparison to candles.

Good features for price-based and volume-based bars, charting and reporting would help differentiate Zorro from the many mid market and even quant level platforms that seem to handle this badly.

For building accurate forex Renko histories, Dukascopy offer pretty clean tick-level price histories for free. They can be accessed easily with the free Tickstory utility.