How about a minor change to the current LFG system (yes I know, there are bigger problems). One thing I noticed is how unsatisfactory it is, when you LFG with the grouping tool as DD for more than 20 min and get grouped with a run the has already killed every boss except the last one. This becomes a problem if you run the pledges. How about counting the bosses as "done" for LFG ppl joining the run? I cant see a way to use this for exploiting achievements willingly. Or just remove the cooldown in that situation.
Oppinion: Like I already mentioned in another post: I am a tank and I am always willing to help people to finish stuff. But with the recent nerfs to CC, these problems and the "hammering the button to join a queue", I have to admit, that the LFG tool is becoming less attractive for me. Since I have the alternative to play in my guilds, I guess this causes little damage on the side of myself (or like minded people). But it makes it way harder for the average player, who just wants to do veteran content from time to time.