Your comments

-1, the cursor is usually occluded by the mouse pointer while selecting and it's very hard to notice this, and having the cursor while there is an active selection does not lead to any confusion. would be ok to have it implemented just for consistency's sake, but should be a very low priority.
I would prefer if the first click only focuses the folder without expanding it. Having a selected folder in the sidebar is useful for establishing the location for creating a new file. Expanding could happen only when clicking an already focused folder. Or this could be configurable :)
Edit your .sublime-project file and add a "folder_exclude_patterns" key:
      "path": "/some/path",
      "folder_exclude_patterns": [".*"]

Build systems don't even have the environment defined in ~/.MacOSX/environment.plist — I have PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin there, but build systems run with PATH=/usr/bin:/bin:/usr/sbin:/sbin and make doesn't find my gettext tools in /usr/local/bin.

OSX 10.6.8, ST2 build 2139