The way I work is that I have a media drive connected to my macstudio. Each job (theoretically) has it's own media drive which my client pays for... All my media, previews, autosaves, proxies etc. live on this external drive. I often visit a client with my external drive and work with them on their system (love how easy it is to temporarily authorize my license on my clients computer to work at their office). Now, unless I missing something, after I create a new project I have to go to project settings to set the various scratch disks... Not a big deal, but would make my life easier if I could set this in the new project window... Every once in a while, I forget to set the scratch disks, so the folders are created in the folder where all my premiere projects live (in a folder on my startup drive that's automatically mirrored on dropbox). If I'm not paying attention these files can jam up my startup drive (not a pretty picture)...
And would also be nice if I could point to a folder on my media drive and all the scratch disks would be set to the folder. Again, not a big deal, just have to click down resetting each of the scratch disks.
Not sure anyone else works this way... so speak up if you do and if you like this idea.
Thanks as always to the adobe team. You're doing a great job.