I just installed your a standalone version of Special K (Steam Beta v 0.11.0.45) pre-configured and i cant turn on fullscreen mod. It will be great if i will be able to turn on bordless mod in 1280x720, my native resolution is 1366x768
Use this version:
Rename that to dxgi.dll, then turn off the resolution override and set SwapChainWait=0 in the INI file.
It worked for me, thx a lot