What is wanted from a scripting engine?

Hey, I'm (still) working on the scripting engine for my game engine... I've gotten a tad bit side-tracked, and was wondering... what features/abilities to people want a scripting engine to have?

Just post some ideas... anything is helpful.

So far, what I can think of is mainly ideas from C++, TorqueScript, and GameMonkey...

Typed variables... inline initialization of objects... the ability to treat functions as variables themselves (which adds a whole new slew of capabilities)...