I just like the aspect of having a NH skinned one. And if you could create a search.php one it would be simple as microwave pie.
Yeah, I wouldn't mind having nerfhaven.com/google.php as our skinned search engine, but I can't afford the Google Appliance <g>
Regarding your question though, that would really be up to the IBF dev team. I'm about to upgrade to 2.1 Final so feel free to check the feature set for that if you like. I'm not sure if they have changed or plan to change the fact that search is built into the index PHP code. I don't really want to go stripping that function out into a new file because I'm not sure what else in the codebase the change would impact.
Edit: I just checked 2.1F - they haven't changed it.
GoogleNH looks like the best we can do for now. I have to admit that I've become strangely dependant on that plugin, my searches have become so much more accurate and efficient. Thanks for inspiring me to create it!