Hey,
Got some more suggestions which might help others and me :p
Here we go:
1) Horizontal Skill Bar : I know it wont really make much difference but I have played USKO alot and I have been playing it horizontally the whole time and now watching it vertically kicks in my OCD for some reason xD
Would be awesome if there is a option to Rotate.
2) Lock Skill Bar : Many times when I use my mouse to use any skill on the skill bar or even click near skill bar side it makes that skill removed from the skill bar. So a lock on skill bar would be awesome so that we dont have to set our skill in the middle of a huge PvP.
3) Allowing to Type more than 1 line in PM : I know I know... Not a huge thing but still only able to write 1 line and then press Enter and then type again is a lil annoying
4) Town/Seeking Party : A button of Town and Seeking Party at bottom middle bar would be far more usable than command or any other. Typing /town or /seeking_party again and again is a pain. The interface should be more user friendly I suppose. By these two buttons alot of people will enjoy more. I know, many will say that everyone will start Towning in the middle of PvP but you get to do it too

:p
5) Features for Party : Here I'd like to point out some points.
A) Allowing to kick anyone from any place. Without this we have to disband the party and make it again cause of 1-2 AFK players at base or hiding somewhere else leaching NPs/Max points.
B) Infront of name there should be a lil sign telling about the players class.
This way we can concentrate fast enough on Priest who needs help from 7-8 sins and 5-6 warriors on him...
C) By pressing TAB you can cycle between your team mates selection. On the right side you see your Party. When you click over there on one of them you select them but if you want to select the next one you should simply be able to press TAB and it will select the next guy. It helps alot of people like Mages for Tping them, Warriors so they can cycle fast to the guy who is near them and Descent on them and it does wonders for priest. if he's a buffer he can just simply press Tab Skill Tab Skill Tab Skill and it will give buff to everyone line wise.
D) Allowing to change Party Leader without leaving or disbanding party.
E) HP Bars in party HUD should be more responsive. For example: If a rogue is using constant minor then his HP doesnt really increase or decrease in the Party HUD. It goes up or down all of a sudden which is hard for priest to know who's in trouble and who's not.
6) Reskill option along with Class Change : When we Change our Characters Class we get the option of adjusting our Stats points but not for Skill points. Which leads to the skill points of the old character. Providing the option of Reskill with Restat will be really awesome in my opinion.
7) Lightborn Event : I think the Free Play should reset on 00:00 Hours at midnight instead of 24 hours gap. Cause many times it shows the Free Play is on but its actually not and it doesnt even shows the time properly. ( For me it shows like :00 hours )
With this format if someone plays the event at 23:00 then after 23:59 you can play again and it will reset after 00:00 once again.
These are some lil suggestions which will improve the User Interface and allow new comers to be more friendly with it and help alot of other people too!

I hope you all like it

Thanks in advance!
Birdie