So when reading through the changes in Unity 3.2, I saw the following:
Debugger: Attaching the script debugger to (and detaching from) Unity and debugging-enabled players is now possible.
Now, I ASSUME this just means I can attach and detach the MonoDevelop debugger to an already-running Unity process. However, it gives me a small glimmer of hope: Might it also, then, be possible to attach the Visual Studio debugger?