"Flatten" tracks to remove punch and roll residue underneath

Please add a feature where users can for lack of a better term "flatten" a track to remove all of the underlying files created by punch and roll recording.  This will allow for easier editing.  Currently the only way to do this is to export the entire in mixdown as a new file and then bring it back into the multi-track session.  This is a lot of needless work.  Adding a simple "flatten" (like flattening layers on Photoshop or Indesign function will save a lot of repetitive work and wasted hard drive space.  Speaking of watsted hard drive space, the flatten could aloo remove those underlying files that were recorded over saving users HD space.