This is something I keep wishing Massdrop had. I often see these great drops that I'm just not in a position to join but would like to at a later date. I understand there is a request drop button, but that is:
only for inactive drops
you will only get notified the next time it becomes available (instead of a more preferable every time it become available. )
Also on a side note, if there could be images of each option somehow on the order page so I don't have to keep looking back at the main one trying to decipher which option is which image that would be great. That can be a big problem for drops that have things in several different colors (especially when those colors are quite similar or the option description isn't very descriptive).
Highlighted and bulleted for your convenience