I was looking for something similar, but slightly different. Not sure if I should raise a new topic for this, or hijack this one, but I would like to move my cursor to the top/bottom of the current scope. Textmate has this feature and it's really useful and just about the only thing that i miss in sublime.
Basically if i have my cursor at the start or end of a scope (function or if block or something), using atl-up/down would take me to the top/bottom of the scope and continue to the next scope at the same level.
Is that possible in sublime?