Hi and welcome!
As Kieran says, the cruise stalk does increase/decrease speed, its just not obvious until the speed actually changes if that makes sense? I know what you mean, as my wife's Mazda will show you the speed you have set as well as current speed on speedo.
The Lex just shows your current speed...as does every car on the planet haha
Can't help with paint I am afraid. You will prob find the 2015 colour palette using Google.