I saw earlier couple of things that could have some improvements like:
How about making buff icons flashing when they about to end? Like 5-10 seconds before buff disable they can flash (change opacity from 1 to 0.5 for 1 second and from 0.5 to 1 opacity for another second - 0.5 and 1 could be changed for anything what will have better look).
This could really help to manage buffs especially when some players have a lot of it (excluding PvE/PvP combat and food).
Loot tab in chat
Another "important" thing (not that important, but it could help and even looks better) is loot tab in chat. What I mean is when equipment bag drops it doesn't have lvl in loot chat tab, so how about adding it like
Where x means level of bag instead of17:14 : Basilisk: 48 Magic Fragment, 13 Vial of poison, 17 Feather, 10 Green Leather, Equipment Bag (lv. x)
17:14 : Basilisk: 48 Magic Fragment, 13 Vial of poison, 17 Feather, 10 Green Leather, Equipment Bag
Combat tab / server log
The last thing is when we kill monster, last hit on screen (which we see above monster body) isn't maching last one in server log e.g.:
Let's take some Trasgo, when it has 100hp and we hit it for 150 damage - game will display that we dealt 100 damage but in fact server tab will display it as a 150 damage hit.
I think that these changes are small but actually can help and won't hurt that much people who are perfectionist.