I strongly doubt it's savepress itself who made your phone "die". The only thing that happens when installing is:
1. Installs dbus-scripts if you don't already got it.
2. Installs savepress. (i.e adds some files)
3. Kills dbus-scripts.

Which means savepress don't really touch your system before a reboot of your phone.

But remember guys, theres a reason why it's in the extras-devel and hasn't got a Announce yet