I couldn't find the guide but that command was indeed the key.
Thanks all!
I'm generally loath to use binds because I bounce between alts so much I worry I'll remember what key works what for which character, so I worked on the macro option.
I found
/macro LtR powexec_location target Lightning Rod
works perfectly (no quotes).
My next goal will be reading up on Shenanigunner's "Macros... now with icons!" thread so I can replace the ugly grey macro button with something more fitting!
:)
Edit:
I found the Guide Shenanigunner referenced (I think, at http://www.dgath.com/coh/ ) and with some experimentation found that
/macro_image ElectricMelee_PBAoETeleport LtR powexec_location target Lightning Rod
gives me a version of Lightning Rod that executes Lighting Rod onto my currently selected target. It does not however create the targeting circle if I have no target, or if my target is out of range. Haven't figured out if that's possible yet.
Edit2:
More experimenting, and I've found
/macro_image ElectricMelee_PBAoETeleport LtR "powexecname Lightning Rod$$powexec_location target Lightning Rod"
will create a macro that looks like the Lightning Rod icon on my power tray, entitled "LtR" if I right-click on the icon, that executes Lightning Rod on my selected target if I have one, or if I don't have a target selected it creates the default targeting circle!
The quotes were important though. Without the quotes, the new icon only executes the first command, producing the default targeting circle - no surprise if you're already a macro master I guess, but important to mention for those of us learning I think.
How did you find the icon to use?