@Jacoh
I'm from that forum and I've to say: yes, you can to put 10 h or whatever you want into DVD5, but HQ? Well, this is a matter of taste but I never did this (and I don't recommend nobody to do it). But if want to do it, even using a quantization matrix optimized for low bitrates encodings (BDVD matrix), you should to use low resolutions and others tweaks in order to get a result acceptable.
You should have in your mind that any technique have limitations, anyone doesn't make miracle!!
If you want to know more about it, go to proper place:
www.vmesquita.com/forum
Regards,