- Configure your explorer (not IE, your Windows Explorer) to "Show Hidden Files and Folders" (I won't post screenshots, as my current Vista installation is in Danish)
- Go to your root "/Website" directory for your solution. Mark the two folders; "App_Config" and "Sitecore", rightclick, and check the box "Hidden" (found right below readonly). It will ask you if this should apply to subitems as well, just say no to that.
- Fire up your favorite Visual Studio (I just tried this with Visual Studio Express 2008 and it worked fine), go "Open Website" (or "Open Website in Existing Folder", all depends a bit on what VS version you are using)
And there we go.
From here, I rightclicked the "Website root" and selected "Add ASP.NET Folder" -> "App_Code", tossed a few class files in there, made up a few references to this code from both .aspx pages and .ascx sublayouts... it all ran fine, and I never needed to manually compile (ah, the good old CTRL-SHIFT-B) once.
Does this qualify as conclusive evidence this will work? Absolutely not. But if the method of moving the folders out is "under evaluation", maybe this should be as well? Seems to me to be very straightforward.
I'll work with it for a while, see if I bump into any unexpected mishaps.