Hi Tracey,
It's incredibly coincidental that you should ask now, as just yesterday I posted a set of new ES samples on my website, which includes a script to do just this:
http://www.weststreetconsulting.com/WSC_ExtendScriptSamples.htm
This is an advanced script that takes some configuration for specific environments. Instructions are contained within.
Now that I have been using it, I can't believe I didn't do this many years ago. To press Ctrl+B and get an element to wrap is so, so convenient. As an author who does lots of bolding (along with many other formatting things, obviously), this will add up to significant time savings in the years to come.
If you choose to use the script, you'll likely want to set FM to run it automatically on startup.
Enjoy!
Russ