I would like to suggest for new system that shows at world boss top 3 or 5 players who deal the most damage to it, and maybe even increase loot for them.

It could show either best players from current channel or from all channels combined. Maybe even both :)

Just something I would find interesting to see while killing world bosses.

3-5 players seems low, better to extend it at the first 100 players who made the most damages.

Also, it would motivate more players not to stay afk after 2-3 hits (at least the ones who have some stuff but usually are bored and stay afk).

+1 for the idea.

Yeah such system already exits and even the number is around that.

I know I'd probably never make the charts, but yeah, it's a nice motivation for doing damage and sticking with the fights.  Maybe they could make a special bonus for being top of the charts twice in a row.

Good idea to encourage players to do the world bosses and thank the 5 players who made the most effort while giving them a reward for their works or even a ranking

The intention is good but the problem is that the ones who do the most damage are already the players who are the most geared. It's basically a system that would fuel the rich to become richer. Personally, I think something more on the lines of "active combat time" where you're constantly dealing damage would count towards this. It would have to be adjusted on a class-by-class basis or based on time between attacks since some classes (ie: shai) are like potato in speed. So competing shouldn't be based on speed but rather up-time. At least I think.