Something complex that would be nice, how about this:

A way to prevent players from ever spawning inside of something so they can not get stuck. The program should detect if there is enough space to spawn the player and move the location slightly if needed to prevent them from being stuck. If there is not enough space to spawn the player safely such as if a vent was targeted then it falls back to just spawn them at spawn. This would be very useful for races that respawn or teleport players back to locations that sometimes result in them being stuck.

Some of those changes are luike 3 second changes frenzy...

I have some ideas anthony

How about instituting a MANA system for spells skilsl abilities etc. with a variable for mana regen rates

How about totally categorizing shopmenu items

How about a complete seperate system of currency collection with a PERMANENT shopmenu with slots, so someone can play a month save up 50,000 [currency] for a helmet that reduces heaad shot dmg 10% always.... this way server owners can sell this currency and make money! (My wow server has this and makes 500 times more $ in paypal then War3 - yet war3 is more popular)

How about adding different RACE TREES. so instead of only restricting races based on level requirements we can add a RACE category such as elf orc human or undead... This way you could be total level 300 in ORCS but only total level 200 in HUMANS and each TREE of races would provide different available races....
-Also would allow us to make all skills target or affect dif races differently, so my Holy Light skill could not only heal but use as a weapon against players using undead races. etc etc

How about keeping track of buffs better and includign more so that the buff system while revamped could print out current buffs in a playerinfo page, plus adding a negative ro positive buff set up so that things liek dispel could only target negative or postiive... also allowing a priority system to let other races affect teh buffs of the original race without losing track of the original race buffs , for temproray modification.

Yes in terms of difficult challenges the shop categories are the easiest,

The mana system your referring to in sourcecraft jsut sounds broken to me or poorly coded (I will admit I am not familiar with that though)
Mana system should have a max and regen etc, things like mana burn and mana flare become cool, and instead of cooldown it allows for total spells per round, also allows for items that provide extra mana or skills relating to mana and regen as well./

Teh race category was for more race integration I am not super sure if this is a good idea or bad but thought it was worth some investigation,

I still think the permanent shopmenu that lasts forever based on a seperate currency is the most important... You could say provide 1 credit to a person per kill and sell a small item for 50,000 credits. This would allow players to have more long term goals since any busy server gets players that max out races FAST, and it would also allow server owners to say charge $1, per 1000 credits or something like that, sot hat they can raise money for the hardship of server ownership.

I do something liek this on another server and it is awesome!

Whats next?