I think it would be very helpful if the default listing of items added to the dropbox (appearing under in the Dropbox tab and in the Files section of Add an Item) were listed by default alphabetically. This would make it much easier to select and cluster a group of files as a single item. Conversely, I can't think of what would be lost by having these files appear in a list sorted by name.
[updated] Argh, you can filter files dynamically by name in both places. Why didn't I notice this? This in effect allows me to select and cluster files and it's even faster than manual selection from an alphabetized list. An alphabetically sorted list would still be useful (since as far as I can see the current order provides no value) but it's no longer pressing.