the option to download first parts of the file

Sometime i use fdm to dowload video file.
With some video player ie gomplayer i can start to watch the video during download, withou waiting the end of the dowload.
This is my suggestion : add the option "dowload the first parts of the file first".
so for example if a file download use 10 sections, this sections are not uniformally divided along all the file, but concetrate on the initial part of the file. In this way i can start watch a movie without waiting that download ends