If you want to disable the ability for bluetooth devices to wake the system, the option is in System Preferences, Bluetooth, Advanced.
I don't want to disable that because I do want to be able to wake the system with the keyboard - either by turning it ON or by pressing a key if it's already on (in the case if auto-sleep had kicked in).
An alternative solution here may be to just leave them on, letting them go into their low power state automatically when the system goes to sleep. And if you then take the laptop elsewhere just within range, but not wanting to use them, click the Bluetooth menu icon, choose the device, and click disconnect. The Mac shouldn't reconnect to them, unless you walk over and press a key/click the trackpad.
That does seem to work - the devices reconnect when they're again physically used. Does Apple specify the low-power battery consumption info on their specs pages? I'm using NIMH batteries, but the less often I have to swap them out, the better.
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