Have tried this for some time, but now I accidently made it right.

Wanted to convert one DIVX to DVD.

I use DVD2SVCD to convert DIVX/AVI to MPG2/SVCD.
On the TAB "Frameserver" I changed "resize to" to DVD 720x480/576.

I did not do the same change in settings on CCE and bbMPEG.

Ended up with 2 files nicely cut for 80min CDr discs, but compatible with DVD-R and with SVCD quality.

Encoded 2 more movies and used Ulead DVD Movie Factory to author and burn on one DVD-R disc.

Plays great both on my Pioneer 444 and my old Pioneer DV-909.

3 full movies in good quality on one DVD-R disc.