set working directory for ALL operations in v10

Idea created by Tift_Tax on Nov 9, 2010
    Ever since version 8.3, I have been asking ESRI to reproduce a function  that was native to Arcview 3x - the ability to set a "working directory"  for individual projects.
    Not just a scratch workspace, but a directory  where EVERYTHING would be placed, be it geoprocessing or saving or  exporting ... everything. (Since ArcMap likes to put some things in the  last folder opened, regardless of which project is currently in use, I  spend too much time navigating through folders.)