I haven't been able to find anything definitive on this but it seems that setting FEATURE_BROWSER_EMULATION to 0 will allow the webbrowser control to use the highest installed rendering engine. At least it has worked on all machines we have tried it on with ie9, ie10, and ie11 installed.
That value doesn't seem to be documented anywhere by Microsoft that I have been able to find and only a couple websites even mention it and they seem to question whether its supposed to be used this way or not. Unfortunately I had found a website that had said to use it but as is want to happen can't find that website anymore.
Anyone have any further information on this?