This add on allows you to create two macros... one for saving a player name as your "main assist" and another for actually assisting this player.

Use:

Select a player friendly target. Click the first macro. That player is now saved as your main assist.

Click the second macro to assist that player. The second macro will work for that player unless he is out of range or you change your main assist with the first macro. The main assist name will clear when you log out or click save with no one targeted.

First macro: /script SetAssist()

Second macro: /script AssistCurrent()

THIS ADDON REQUIRES LIBSLASH