You can foil pretty small emblems and scripts. All you need are a sharp knife, a magnifier and a steady hand. Sometimes, though, it is easier to use silver paint on small items like door locks and small scripts and emblems... they're so small that silver paint will give you a passable "chrome" effect.
Some people will take a piece of foil and cover the scripts before they paint the model. Then after painting, they remove the paint from the high spots of the script detail by using a polishing kit to reveal the foil.