<stpt> will create a blue arrow on your party list, allowing you to choose members for the target of a spell by scrolling up and down the party list itself with the arrow keys, starting at the person whom you were originally targetting.
<stal> is the same thing, but allows the arrow to move up and down into the entire Alliance list rather than being confined to your party.
Neither of these are affected by blinking, because you are not targeting a player. You are targeting their name on your party list. They were added in a patch a few years ago, and I've recommended them to every mage I've met since then. Unfortunately, most people are just too lazy to switch, and that does make them bad mages.