Again on the ZX subject, here's a thing that bothers me in the first ZX... Well, two things.
First is how Overdrive drains over time. It's specially jarring due to how you can simply turn overdrive on, use an attack, turn overdrive off, all to save energy. So my idea: Overdrive doesn't drain over time, but instead by using attacks while it is on.
Second: It would be nice if charged attacks had their OD usage halved. Specially since they ARE puzzle solving elements too.