Medium resolution batch zip download

[Fireballcz]

Currently Lychee allowes just original images batch zip download, but separate images can be downloaded also in smaller resolution. Would it be possible to download also ZIP of MEDIUM RESOLUTION images in the future builds? I think this would be an interesting feature.

Background: my medium images are in 1.280x1.024, which could be for many visitors enough. As an advantage, this results in much lower traffic.

Maybe a hint, where to alter the code, to set this feature as a default one, in current build, will be very helpful. I think that just change the source folder for zip routine, should be good, before (if) this feature added.