DropDMG 3.3 is now available from the Mac App Store: c-command.com/store/mac-app-… (4 hours #macreviewtime)
@JarrettGoetz You can, however, make a read-only copy of a disk image (using the Convert feature) and mount that.
@JarrettGoetz No, current mounting options are here: c-command.com/dropdmg/help/m… But that sounds like a good idea for a future version. Thanks.