Hi,
I've not been around very long and I've heard that LSL doesn't change much between versions, but personally I'd like to be able to define enumerations.
IMHO, it leads to more readable and ultimately stable code.
I'd also like to see some kind of Intellisense when writing code. I don't know how much people use the in-game editor - I always use it - suggest a better option if there is one! With this in mind and the fact that a lot of n00bs to the game have never written any kind of code, I think it would be a nice aid. I don't want to have to commit to memory the parameters of every ll* function - similarly I don't want to have to run SL in a window just so I can have the scripting guide open as a reference.