Idea about making powerhour behind command rocks.
When you type for example, phour start, it will begin and you will gain that
double-exp until one hour passes.
There also could be option like phour autostart_on/off, then powerhour would
be as it is now.
As we all know, powerhour makes getting partymembers for quests/other twiddle
pretty hard (who would waste exp?).

++Beliah Thevil