Please help he so that I don't have to spend 3hrs re-rendering. Seems like something that is simple. I'll stop drinking Jaeger when making DVDs from now on.
You could investigate one of the the techy DVD file editing programs like IFOEdit or VOBEdit. I haven't really use either one, so I'm afraid I wouldn't be any help. I do use MenuEdit, but I don't think that lets you turn looping on or off. All of these can be found by using Google.com.
Using only DVDA, though, all you can do is edit your project and re-prepare the disc. By why a three-hour render? Are you brining non-compliant MPEGs into DVDA? Tsk tsk. :)
Whenever possible, get your video and audio into the proper format in Vegas or something. A prepare and burn from compliant files takes, like, half an hour or so.
I had to squeeze a 2:15 minute dance recital to the disc. The only way that I have been able to fit it is render everything as avi and then change the bitrate so that it will fit on a cdr. Man the stuff you have to go through to produce a long format DVD. Is there something that I am missing?