Question customizing classes?

If you look at the previous answers to your question, there is your answer. Coding.txt will be a great place to start, and then look at the stock skills/spells. They will serve as a good template. Start small and just modify a spell by changing maybe it's name and a few of the values, and change it more as you start to learn how it works.

tyfighter wrote: So as far as giving people special abilities to interact with the world such as someone with ghosting powers the abilitty what woukld I do then?

It would depend on how the ability actually functioned.

It would function as access to certain areas for.quests or whatever. Like you would need.someone with ghosting to take your party through rubble of a site or a locked door to a lair.. any case that is the idea7

For something like this you'd probably want to look at a skill like SKILL_HIDE or a spell like SPELL_DETECT_MAGIC which applies an affect flag to a player for a period of time. Then you'd create a new affect flag like AFF_GHOST and use this to discern whether a player can enter certain areas.

Additionally this could be done with scripts.