A Sistor

With Sistor you can bind a button.
Hold down alt and press the bound button while targeting someone.
Now whenever you press the button you assist them.

You can have up to 5 buttons bound this way.

-------------------- Why Have this? ---------------------
Cause if you hate having things block your view this has nothing.
If you need to switch assists often and dont want to mess around with macros. Set it and use it... no worrying that you spelled their name right.

---------------------- How to use --------------------------

** THIS IS FOR 2.0 **
Step 1: push the esc key (main menu)
Step 2: click on key bindings
Step 3: scroll down until you see "SistorButton1"
Step 4: click the first box (key 1 column)
Step 5: choose a key or combination of keys to bind your assist to
Step 6: click "okay" at the bottom of the "key binding" box
Step 7: click "return to game" on the "main menu" box
Step 8: hold alt and press your key while targeting someone to set the assist
Step 9: press your key to assist that person when they pull a mob or group of mobs (very handy in a "messy" raid like stratholme, scholomonce, etc.)
Step 10: enjoy your new mod without adding more obstruction to your view!

** THIS IS FOR 1.1 **
Step 1: push the esc key (main menu)
Step 2: click on key bindings
Step 3: scroll down untill you see "SistorButton"
Step 4: click the first box (key 1 column)
Step 5: choose a key or combination of keys to bind your assist to
Step 6: click "okay" at the bottom of the "key binding" box
Step 7: click "return to game" on the "main menu" box
Step 8: hold down you key or combination in game and click the player you want to assist
Step 9: press you key or combination to assist that person when they pull a mob or group of mobs (very handy in a "messy" raid like stratholme, scholomonce, etc.)
Step 10: enjoy your new mod without adding more obstruction to your view! =)
(1.1 Guide by osimo)

NOTE: You can also manualy change who you assist by using
/sistor @name = where name is the person you wish to assist.
/sistor who = Will give you the name of whom you are assisting.
/sistor = Will give you a help string.
/sis spam = Will spam out who you are assisting to say channel