We added an extra jalapeno pepper and used Thai basil, but we found this borderline bland. It needs much more heat and flavor. I would probably throw in 2 or 3 Thai peppers if I were to make this again.
I'd suggest using green curry paste, rather than curry powder, for a fresher and more authentic flavor. If you can't find Thai basil, again I'd suggest using regular fresh basil rather than cilantro.
Very good - we all enjoyed this. I used just 1 jalapeno, and I omitted the ginger altogether because the heat level was perfect... which is to say plenty spicy. I found it easy to mix the coconut milk and cornstarch right in the can with a slim whisk (save washing a bowl). Next time I will add a little more basil to the dish. This is a winner!