Actually, Stealth isn't a "specialized" skill or one that is needing to be specialized. I was only trying to convey that the skill had multiple uses.
Skills to be Specialized include the following:
Combat
Crafting
Lore
Magecraft (Learning Spells, Runes/Scrolls, Identifying spells, & Use Items are part of the basic Magecraft skill, may be specialized into specific magical lores/crafts).
Performing Arts
Spellcasting (each School of Magic is a specialized skill - universal spells fall into the highest ranked skill)
Riding (only requires specialization if you have mounts very different from the normal horse and horse-like mounts, such as flying mounts, or aquatic mounts, etc.)
Easiest way to tell which skills need specializing is to look at the second page of the character sheet, which gives you a few blank lines for those that need specializing...
Gimmickry and Stealth do NOT need specializing, they are simply broad skills.