Re: STr button
STR sharpens up the throttle response, but it cut in anyway when you put your boot down, see the orange light go on and off when clogging it.
Some may say the STR button is a way round the emissions and economy regs, take the necessary legal tests in the default position (ie off) and then give the owner the option of returning the car to how Alfa intended, is STR on. Power to the people and all that.
Bottom line is the car is more responsive with the button depressed and no less economical with it off.
Not sure on the cruise control, something to do with the left stalk IIRC, but not got it on my car so not sure, one of the other guys will be along soon.