I already have multiple folders in numerous projects. for example, I have a project for an android application that has the main android build tree plus another directory containing code that I use to create the data used by that android project. BOTH of these directory trees are "ONE" project under sublime.
However, that android application also makes use of an android NDK library that I am building. That library is a shared library and could potentially be used in numerous android projects and would not be considered part of any of them, it is its own separate project under sublime text.
Would be nice to have a side bar that looked like this
right click in side bar to open a project in the sidebar, select project in side bar, right click and select close... etc etc