Wouldn't you pretty much have to restrict yourself to a limited number of skills and weapons in any case? Even though the game doesn't force you into any specific builds, practically you are going to have do some specialization, either due to playstyle preference or lack of stat/skill points.
I believe Swalnak wishes to know if magic can be used as the primary combat skill, without having to rely on summoned beings or your creature either for protection or to do the majority of the damage.
It has been mentioned that stats, skills and equipment can all influence each other, and there are secondary stats based on the primary ones. Even without class differences from the start, proficiency between magic and conventional combat should start changing as you develop your character. If body type is selectable or changeable that hasn't been mentioned yet, that I recall, but at least equipment-wise you should be able to make appropriate selections.
