My laptop has the option of receiving 5 Ghz instead of 2.4... petvas, if I set my laptop to receive at 5Ghz instead of the default 2.4, then it should provide less interference yes?
I'm not too good on these frequency things lol... but I'm sure my controller disconnects even when the laptop is off (hence providing no interference).
Theoretically, could Sony release controllers which use a different frequency? (a long shot, as you mentioned that Bluetooth can use the whole spectrum)...
You could switch your laptop to 5Ghz but you should also do the same on your Wireless Router.I have tried that at home with my Airport Extreme and I got no drop on the signal of the Sixaxis Controller....