I am personally surprised Shaiya is still around after my 5 month leave into the scary world called....outside D:
Anyway...I personally prefer an Ep5 server with a mix of ep5/ep4 skills.
(Not hard to complete if you know what you are doing.)
I think ep5 is better due to the fact is has more maps, monsters, and items.
Customization of a server is actually a really good thing if the creator knows what he/she is doing.
I personally experimented with different ways to tie ep4 and ep5 together and they worked out well most the time.
My servers never lasted due to my very poor choice in staff. Lol
Basically what I'm saying is that why not a combo of both episodes?
If done right that can make for a great server.
Not all maps have to be what they are meant to be.
I made Kanos into a full MM map that involved the alters.
So you were required to kill the alters to get bless and make the main bosses spawn.
This map only opened once a week so it was the only time bless could be popped.
Just an idea :P It was very difficult to get correct though >.>
Mostly because I had a **** ton of mobs constantly spawning and I needed to set the spawn times correctly as well as set everything by hand.
-Edit-
To add to a little bit of the ideas...
Maybe making new classes as well? Yet opening two servers so one is normal while the other is custom.
Creating a custom class isn't hard either.
Any item can be edited to be used on any character type.
While any skill can be changed to be used on any class.
Retexturing is always nice as well. If you are a good artist I would suggest changing some stuff around.
Like I personally put in the time to completely retexture the game world.
That took a lot of time but made Shaiya look quite different
lol (in a good way)
Another idea may be to completely rework the EXP system. Instead of setting it with a command actually set all the monsters EXP offerings in the database by hand.
Yes this takes a lot more time and work but it offers a more stable and enjoyable gameplay experience as of leveling.