The skill feat "Sign Language" states that you learn the sign languages associated with the languages you know, but that doesn't really make any sense. Sign languages are full languages on their own, with their own grammar, vocabulary, and structure separate from spoken languages, and their ancestries are typically very separated from those of spoken languages. American sign language's closest relative isn't English, but French sign language, and Finnish Sign Language's closest relative is Swedish Sign Language, despite Swedish and Finnish languages not being related. The rules should handle Sign Languages just like they would any other language, there's no reason for this feat to exist that I can see.

A real world concept more similar to this idea would be Manually Coded Languages, which are ways of conveying spoken language through signs, but are not sign languages, any more than written languages are a language separate from their spoken form. Sign Languages are specifically distinct natural languages. Maybe they should make a "manual code" feat?

In my time playing pathfidner, I often find the most fun and intereting spells aren't ones that are most mechanically effective that you bust out during combat. An obstruction, a few points of damage, a buff, all very useful, and they make up the majority of my prepared spells so I can deal with combat when it comes, but I usually have the most fun with non-combat spells, things I can do out of combat that have fun applications. This like my wizard picking up her entire wagon and running flying away with it, or using her blood to turn a stick into a masterwork club.
I usually play wizards, to this ends, but more and more I look at clerics and wonder what fun they can have. So, I want to ask, what are the cleric spells that you have the most fun with? What do you enjoy casting the most?