Would be useful to be able to rename a rule .
Yes, very useful.
There is a way to do it by exporting the Rules to an xml file, editing the names in the file, and then importing it back into eM Client. 
An easier way is to click on “Modify rule”,then click on “next” 3 times until you get to “Finish rule configuration”, change the name and click on “next” again.
Absolutely correct David!
I had never clicked next through to the end. I always just click on Finish when I am finished. Thanks for that.