While the server is about as customized as it gets, I assume you are referring to the combat system which has been, for the most part, untouched until you reach about level 150-200 depending on your vocation. There are custom animations to make the regular tibia spells a little more interesting, and the damage/healing formulas have been reworked but some more changes may be a good idea.
Thanks for bringing this up, I've considered it before.