SP2 and Single Engine Taxi

I saw from one of the beta testers that the 777 will have the ability to do single engine taxi realistically. I asked about which new features/enhancements we would get on the NGX when the 777 came out, and Ryan said he would post a list once SP2 for the NGX was out, but I have a question. Will single engine taxi be one of these new enhancements to the NGX, so that it can taxi on one engine realistically just as the 777? Or will it not be fixed in the NGX since this is something that, I assume, can't be easily ported over due to the fact that 777 and the 737 have different engines with differing performance?