No idea what PAWNO is, but blahblahblah is correct. It's AngelScript. But it's not like the language itself may cause that something is hard to be implemented or not, language is...only language. It's how it "sits" in engine and other stuff that you have to learn.
But I dare to say it's more 'imperative' than one could expect from scripting system, so it obviously gives you more power, but also is a bit harder to grasp.