Today, I've released GePeS 0.2.0. The only major difference is that it should reduce power consumption of your phone while it is running. Reducing CPU usage when application is not active was definitely on my roadmap, though email from "Publisher Support Specialist for Nokia" about this actually pushed me to investigate the issue.
It turned out to be quite easy to disable sensors while application is not active and it did the trick. While doing this I also moved to using AlignedTimer to synchronize wakeups with other possible wakeups in the device.
As usual, the application sources can be downloaded on GePeS page, binary will be soon available in Nokia store.