Comment 13 for bug 538558

What about this:
When opening project, if project path has changed, warn the user and ask if he want to do a manual or automatic file path update.
Automatic is what is described above,
Manual open the 'collect files/fix path' window (to be designed)

Basic function offered by the 'collect files' window would be:
For each file referenced by the project:
1/ Displays last known path,
2/ Allows to handly (over)write file path,
3/ Sugests new location (normalized subfolder, updated relative path, original path, ...)
4/ Displays GreenCheck/RedCross icon whether file exist or not,
5/ Checkbox for 'copy' / 'transcode' file from last known path to new path (active only if file exist in last path but not in new path)

Pint 5 might be out of topic but such an option would help me to work on HD footage using my laptop. I could easely transcode footage I am using to a 'low quality/easely decodable' format and revert back to original HQ before rendering.
Step1: Import video files from absolut path location
step2: 'collect files' -> 'copy' with the new location in a 'HighDef' subfolder
Step3: 'collect files' -> 'transcode' with the new location in a 'LowDef' subfolder
Step4: for each new file added, repeate step2 and 3 if needed
Step5 (before rendering/fine tuning): 'collect files' -> manually replace 'LowDef' for 'HighDef' in file paths

I do not know if something similar is planed for futur releases.