Backtest with fixed entry amount like a new BarSeriesManager or Strategy

[Cashmeiser]

I have checked existing issues and wiki

• I could not find similar issues
• I could not find a solution in the wiki or faq section

The current BarSeriesManager uses amount as the quantity to use of the price on the instrument.
For example if amount is 1 and closePrice $10 then the entry is on $10. and lets say exit becomes at $11. Next entry the price can be $15 and exit $16.
In these backtest I only find the PnL-percentage valuable, but not the PnL it self. Saying the profit is (in the example above) $2 says nothing in the context of a backtest running on an instrument for x years.

I find it more useful with a BarSerierManager that create trades on a specific amount (with or without re-investing) for example; always enter with $1000. Here both the PnL and PnL-percentage will make sense.

I'm about to write a custom FixedPositionSizeBarSeriesManager which takes a Num value (like 1000) for the entry-amount and then reuse the BarSeriesManager-logic except that the amount value sent to the tradeExecutionModel is re-calculated each time by amount / entryValue.

I dont know yet if it will be as expected a FixedPositionSizeBarSeriesManager or a TradeExecutionModel or just a wrapping Streategy

Is there something similar to what I want to achieve that i missed? If not, and I do this implementation, is it interesting to provide to the lib?