The help file for v5.0 is currently work in progress so you will not find everything listed
Help file > Reference >Custom Commands
You can fill in the blanks by reading over the following thread which lists many of the changes
https://oss.azurewebsites.net/forum/flashfxp/custom-commands/16296-request-custom-command-suggestions.html
(However I am not sure if everything on that thread is 100% accurate, some commands may have been modified/tweaked since my original posting)