Interesting idea, right now Gekko focusses purely on raw market data (eg. candle data). Would be great if we can add and try to correlate external data sources (exchange lag, tweets, whatever) in a way.

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For everyone running windows: Gekko supports a huge number of indicators (100+) via a library called TAlib. Which works great but is almost impossible to compile on windows. I just created a proposal for a similar library (tulip indicators) that has precompiled windows binaries available. If you would like to see this soon in Gekko, please +1 the proposal here: https://github.com/askmike/gekko/issues/708