Okay, sounds good to me. Just follow the DivX to DVD tutorial but change a couple of things.
1. Set in the audio bitrate to 192
2. In the Bitrate tab, set the CD size to 740 ( thats 1/6 the size of a DVD )
3. Encode each to its own separate folder, you can use Batch mode to encode more than 1 at a time. See the bottom of the DVD to DVD Tutorial on how to set that up.
Add the first converted movie into TMPGEnc DVD Author , then click Add new track and load the 2nd into that. Repeat untill all are in, then edit the Menu to suit.