Reboot is most often required - but there are still undocumented functions in the registry that aren't reflected in the GUI (such as the missing Complete Memory Dump option).
Unfortunately, the changes in dump files/dump file generation process' aren't well documented. You can discuss problems using Vista references and find that they just don't apply to Win8/8.1 For example, the DUMPxxxx.tmp file (from Server 2003) is used in 8.1 - but it's implied that it's not used in Vista.
