is it possible to add multiple targets? like a green and and yellow arrow? that would be nice in RBGs for multiple fights and call stun targets and so on.

I would suggest /calltarget1, calltarget2 and so on.

I need someone to change the marker color, since I don't know how to deal with .tga files

managed to edit the marker on gimp and changed color, also already updated the code to put a second marker. just use /calltarget 2 (with a space)