I want a bunch of things in Objective-C. Apple seems good at adding things they need (new exception stuff is neat syntactic sugar) but there are some things that would make life a lot easier for me.

1. Namespaces

It would be awesome to support some kind of transparent name mangling for messages so that plugins using identical names wouldn't crash applications. Sure this may be a niche request, but when you need it, you need it. The method prefixing stuff gets old fast.

2. Simple Enumeration

I'm addicted to the Python for ... in ... syntax - it's just too easy to pass up.