I'm fairly new to messing with my own server, but my understanding of changing skills is: you would need to manipulate the source code and also your skills file (can't remember the exact name, but it's similar to the spells.text file.) I do know that the said skills file you would need to change is not compatible with Titanium, so you would need a newer client.
The thread with all of this information is here:
http://www.eqemulator.org/forums/sho...t=34098&page=2
The topic of the thread is adding skills to classes that normally wouldn't have it. I believe they add track to warrior/sk for instance. I'd assume the same would apply to limiting skills.