A marker is tied to the content (chapter for a CD/DVD, extract for a podcast, a mark for a recall, etc...), so if you add an audio on whatever track and move all the content, you should be able to move all the markers. In my workflow, it happens all the time (I make podcasts, and add the intro at the end, after having marked all my extracts). It is not a matter of tiding to a clip, it is more tiding to the overall content. Anyway, I add a uservoice feature request here, for those interested.
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