i like the idea and i have always wanted to be able to see what buffs/debuffs a party member/alliance member has.
For people arguing about chat filters and being good at the job, that's just plain stupid. Just because a mob does a move doesn't mean the additional effect will stick. Ever had a spider do acid spray and not get poisoned? It doesn't say in the chat log whether or not you get poisoned it just displays the damage you have taken. The only way to know if that player was poisoned is to stare at the HP bar, and lets hope that player doesn't have regen on because then you need to do some quick math to tell if that person was poisoned. So while you are sitting there being a great whm, staring at the chat log and casting poisona to remove the poison your tank doesn't have, along comes a sickle slash and your tank is laying on the floor because you didn't cure your tank because you were casting an unnecessary spell. good job chat log.
here is another situation for you people who are trying to rely on chat filters.
You are fighting a doll, it does gravity field and now your whole party is slowed. in your party is you, the whm and a rdm. because you have chat filters on you can only see what the mob does to your party but not what your party is doing. so you cast erase (or haste) on party member 1, you cast on party member 2 and as you are casting on party member 2 the rdm is casting on party member 3. well since you cant see what spells are being cast and because you are focused on the chat log you missed the animation of the rdms spell so you then cast your spell on party member 3 only to see your spell has no effect. And as you were casting your spell party member 6 gets hit with blitzstrahl, is stunned and then killed because shadows were down and you were too busy to cure. then you blame the rdm for not curing, your party disbands, you get filled with rage, your wife comes in the room, you beat her mercilessly until you kill her, you go to jail and then you drop the soap in the shower only to become bubba's new love slave.
and you can then argue that the wrong chat filters were on and you should be able to see a party member casting, but then your chat filter is too cluttered with all the /nin's casting shadows and the rdm casting and you casting and the mob doing what it does and all the damage and blah blah blah.
Point is chat filters can help or hinder, and just because you focus at the chat log and HP bar doesn't mean you will see all the information happening to party members because its not all displayed.
I hope you shower alone in jail.