Richard Banks posted about a registry key for just such a tweak.
###Visual Studio 2012 (Full)
HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\11.0\General
DWORD: SuppressUppercaseConversion
Value: 1
In PowerShell, you can run this to set that registry key and the uppercase goes away.
Set-ItemProperty -Path HKCU:\Software\Microsoft\VisualStudio\11.0\General -Name SuppressUppercaseConversion -Type DWord -Value 1
###Visual Studio Express 2012
The above registry key is not the one that will affect Visual Studio Express 2012 RC. A comment by FormatC showed up on Banks post about the key for Express. You can find that key mentioned in Mike Gleason's answerMike Gleason's answer or run the following PowerShell command to set it.
Set-ItemProperty -Path HKCU:\Software\Microsoft\VSWinExpress\11.0\General -Name SuppressUppercaseConversion -Type DWord -Value 1
###Visual Studio Express 2012 for Web
Set-ItemProperty -Path HKCU:\Software\Microsoft\VWDExpress\11.0\General -Name SuppressUppercaseConversion -Type DWord -Value 1
###Visual Studio 2013
Replace 11.0
with 12.0
in the registry keys above.
###Visual Studio 2015 Developer Preview
Replace 11.0
with 14.0
in the registry keys above.