What do you mean with easy solution?

a.) Plug in the AC power at my home empeg docking station?
--> Not possible without additional mechanical work. It's a closed box with tuner inside and ethernet connection interface.

b.) via the hijack menu?
--> Not a good idea to switch every time.

At the moment I plug in an empty AC power plug, so that the empeg thinks it's on AC power, even if it isn't. (mechanical switch insite the player)

If I have time, I'll look at the code kimbotha posted to find a solution.