change the DPI setting through a Remote Desktop session
Microsoft has released a hotfix enabling the DPI setting for RDP sessions.
Hotfix info: http://support.microsoft.com/kb/2726399.
Hotfix downloads:
32-bit: http://hotfixv4.microsoft.com/Windows%207/Windows%20Server2008%20R2%20SP1/sp2/Fix396134/7600/free/451040_intl_i386_zip.exe
64-bit: http://hotfixv4.microsoft.com/Windows%207/Windows%20Server2008%20R2%20SP1/sp2/Fix396134/7600/free/451041_intl_x64_zip.exe
Also note that you have to manually either choose to open this file as administrator, or choose a different unzip location. Then run the smaller file that comes out, which will automatically elevate as it should.