and I'm quite sure he didn't try to use MACD and simply "forgot" the signal line. His philosophy is instead: The simpler strategies tend to beat the more complex ones in the long run. Again, I can not judge whether this is a good or bad philosophy, but I like it
The signalline crossovers in MACD may very well respond faster, but it will also generate more false signals.
But of course, it would be very nice to also have MACD indicators implemented in the bot so that the users can choose.
Maybe some day
It is true that EMA crossover is even simpler then MACD, but the bot currently does add a threshold which is also not in Goomboo's journal (I think). I'm don't know a lot about trading but I think MACD is considered an extremely simple indicator already.