MeGUI x264 encode for BluRay: Force I Frames

Hello again, Is there a way to force I frames at specific timecodes during an encode x264 encode for BluRay? To get the most accurate chapters points, they need to land on I frames. Another way I used to do it (for DVD) is to encode each chapter seperately then concatenate them together. Can rawavc files be strung together into one big file? Any applications that do that? Thanks!

it would be extremely useful if that could be exposed as a zones option in CLI.

I agree with Sharktooth, this would help since most people don't dare to touch qpfiles and probably even less people use handbrake or other frontends that 'force the frametypes through the x264 API itself'. Cu Selur