4 and 6 are Left and Right gallery scrolling. + to upvote, - to downvote.
8 should be to Enlarge (same functionality as Enter), and 2 should be to Download full resolution image. (Think up for enlarge, and down for download)
If not, at least consider adding a key to download full resolution, i wouldnt mind, just as long as there is a key for it! Thanks.
Customer support service by UserEcho