Did somebody try to migrate workspace descriptor files from Premiere Pro 2 to 4? I found these files in "C:\Documents and Settings\[username]\My Documents\Adobe\Premiere Pro\[version]\Layouts" directory but it seems that the file format and naming are different. Do you have any idea how to convert these files?
I have not heard of anybody doing similar. Considering the differences between PrPro 2.0 and CS4, I would think that if you could, there would be grief to pay. Setting up Workspaces is a pretty simple task, and I would go at that way, but that's just me.
Good luck, and let us know what happens,