Since you want to edit at 23.976 I assume that you have telecined footage and in avisynth you are doing IVTC+Decimate. What you can do is just IVTC, so that your video will be 29.97 with duplicate frames, and then decimate the finished video at 29.97. You might have a 1 frame difference in sync here and there, so you might have to change accordingly, but that's as good as it can get. Alternatively, you could edit at 25 fps, since you should have the PAL standard at disposal too, and then doing TDecimate(cycle=25), which should bring the framerate to 24fps, but it's not as good as the other solution, I think.
As for the audio, you could always add the original audio back in avisynth, but you'll have to edit with the audio starting at the very beginning and ending with the audio end.
Here is the avisynth code assuming that you want to get back to 23.976 from 29.97 and that you want a second worth of black video + no audio before and after the actual amv:
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video = avisource("your export.avi").killaudio().converttoyv12().TDecimate(mode=1)
audio = wavsource("your audio.wav")
amv = audiodub(video,audio)
leader = BlankClip(24,720,480,"YV12",23976,1000,44100,true,true,000000)
leader++amv++leader
If you want credits with a different audio in your video, you can make them separately like if it was a video by itself, and then you could put them together like this:
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video = avisource("your export.avi").killaudio().converttoyv12().TDecimate(mode=1)
audio = wavsource("your audio.wav")
amv = audiodub(video,audio)
vidcred = avisource("credits video.avi").killaudio().converttoyv12().TDecimate(mode=1)
audcred = wavsource("credits audio.wav")
cred = audiodub(vidcred,audcred)
leader = BlankClip(24,720,480,"YV12",23976,1000,44100,true,true,000000)
leader++amv++leader++cred++leader
If you want to make an audio cut, you should do it in Audacity -
here there is a simple guide to edit audio in audacity and a link to the download.