@Gabriel, what would you like to see added?
Well I'm sure I've said this on a few different threads already, but since you ask, I could personally benefit greatly from properties, weak references and access modifiers ( ones which really work ) and benefit somewhat from overloaded functions, overloaded operators and method pointers. I'd also really like interfaces although possibly you can fake interfaces already with the "new" reflection stuff which I really haven't looked at.
Oddly, I'd also like to see other features added which I wouldn't personally benefit from because I think the people using the language would benefit, and the language itself would benefit. The most standout of those features would be threading. As it stands right now, threading is a big, but forgiveable omission. In a couple of years from now, it's probably going to be a dealbreaker for most people who would want to use it at all, which very much puts a big dent in BlitzMax's shelf life.