Set notes that don't affect the original file??

I have made a playlist with 20 songs that all have memory cue notes where I mix in, mix out, start looping etc etc. These memory cues stick to the file so that they are not changeable without losing the original notes should I ever want to use the same song in a different set. Is there any good way to mark up the songs with notes that only show in the specific playlist? Or due to it all working around metadata there is no way.