Re: So Now Your the Sorcerer Supreme
A sorcerer Supreme would have Scholar and Scientist, with quite a few skills and "sciences".
He (or she) might well have a VERY high roll for one or more general skills and count on using it with minuses for details, but he would still have at least half a dozen knowledge skills, for example:
Magic (VERY high roll), Mystic/Occult world (high roll) plus Myths & Legends, Ancient Societies, Demon Lore, Other planes/dimensions, Magical Societies, Mystic Supervillains, Para-psychology, Ancient Languages, History, etc.
For science skills: Magic (either very high roll, or numerous types of magic), Para-psychology, and probably several others, either modern sciences or medical/psychological ones or social sciences.
They would also have a variety of other skills, possibly with other skill enhancers such as linguist, traveller, jack of all trades. The skills would definitely include Magic Skill, Spell Research, Analyze Magic, and probably Cryptography(Only to read ancient/obscure languages); and probably a variety of AKS.
They would also have a method of understanding other people/beings such as telepathy, universal translator or knowledge of MANY languages.
For characteristics, they would have high INT, very high Ego, and probably very high PRE.