Would be nice if the rewarding System would be something along the lines of when you joined in on the fray in combination with the damage/healing done or enmity generated rather than just the contribution you had when killing the mob or completing a fate with your damage/healing done or enmity generated throughout the encounter.

So something like this would be really nice:

If you are there from the beginning and meet a pretty low threshold in terms of damage done, healing done or enmity generated, you should be rewarded with full credit in terms of contribution.
If you join somewhere midst of a battle, you still have to meet at least that already pretty low threshold to get the 60% contribution rewards and a higher threshold to obtain full credit.
If you join when the fray is almost over (which is probably very unlikely to happen in most cases), you get that 10% contribution reward even if you hit the mobs only once and have to meet pretty high thresholds to get the 60% or 100% rewards~

Mya, won't happen but would be nice to have, since I don't get why people that were there from the beginning but are not in a group, should be at a disadvantage even if they are doing the same or even more DPS/HPS/enmity generation than others~