+1 to this but as previously mentioned in another post, it should only be implemented on job classes that heavily depend on it... I.E. linker for both Taekwon & HP.
If you give a support pet to say a Job that's heavily used in pvp (LK, Sniper, Prof, WS, Champ, etc..), it could be classed as too OP/Broken.
My view with this suggestion~