Myriam, I think using the ID forum as the first choice would be best. The bin isn't intended to be a highly interactive feature. It's just a hole to throw images in when you don't know what they are.
The biggest use is to move plants away from other plant entries into this, rather than just deleting the image.
The forum will remain the best feature for getting actual IDs. I think there's a good idea to setup a whole feature around plant identification but that's for another day
