I'm sorry, but these problems cannot be solved inside FBReader180.
1. Feature "sleep" is caused by sleep of gyro(or wrong processing of it in system libs).
CPU at this point is in sleep mode and gyro have to wake up it. But gyro doesn't.
I've talk about this with PocketBook developers but there is no solution still.
2. Keypad auto-lock cannot be prevented because there is no API to do that.
Again PocketBook developers are notified but still nothing.