does the shrink command in disk utility (which is avail as both a toolbar command, a menu command, and a contextual menu -CM- command) protect the user from inadvertently making the dmg too small? …
ie, can the shrink command, in effect, arbitrarily delete the contents of a disk image without giving any warning to the user?!
it is too bad that diskutil does not have a gui that shows how the dmg is allocated! … (like the partition manager does).
could you add that visualization for ver3 of dropdmg? – (afaik) there is a dmg quickview plugin for the finder, so it should not be too difficult to create a minimalist file browser for the dmg (outside of the finder itself).