This could be a useful command.

Until it is implemented you can 'rename' a hash table by using this alias:

;Usage: /hrename <oldname> <newname>

Code:
alias hrename {
  ;1=oldname 2=newname
  if (!$2) { echo -a /hrename &lt;oldname&gt; &lt;newname&gt; | return }
  var %h.size = $hget($1).size
  var %h.file = temp $+ $ctime $+ .htb
  hsave -sb $1 %h.file
  hfree -s $1
  hmake -s $2 %h.size
  hload -sb $2 %h.file
  echo -a $1 data backed-up as %h.file
}


(untested)

-genius_at_work