Depends on who you ask.
If you asked the OSHA guy or my wife, your feet wouldn't leave the ground without you donning a harness, parachute, flame retardent coveralls and an up to date vaccination record.
If you ask me, I'd say that is a fine idea. But then again, I have climbed trees and trimmed branches. I've stood on a ladder, on a roof, and even on a 55 gallon drum. I have actually revved up the saw, aimed, and JUMPED up to whack one last limb that I couldn't reach from the ground. But then again, I have numerous stitches and came extremely close to lopping my arm off at the elbow. I do not recommend emulating my cutting style to anyone, even trained stuntmen with OSHA/Wife approved gear. Use the wife's train of thought:
"If you would yell at the kids for doing it, it probably isn't a good idea."
Now, as to your electric chainsaw idea. We have one here at work in the shop. We use it to cut off ends of lumber and cut up old used wood to fit into the burn stove. It is extremely lightweight, so you could use it one handed whilst standing on a ladder and holding on to something else. It is very quiet so it won't wake up your neighbor who works graveyard shift. There is no bar oil to add, no gas to mix, no spark plug to clean and gap. No yankin' and crankin' to get it fired up. Pull the trigger and you are whackin' stuff down.
You are limited to how much cord you can stretch out, but I never had any problem reaching any of my property with an electric hedge trimmer. This thing doesn't have alot of power, so limbs are about your limit. (Limbit? Limb-it? Hmmm.) Anyways, you ain't gonna drop a tree with one. But it sure beats the heck out of that pole/rope/limb saw jobbie, as you can cut up the limbs when they reach the ground.
Being who I am, I say this. ON the record I say "BLASPHEMER! How darest thou consider such a measly saw!" OFF the record, I say you'd probably clean up your household stuff just fine with an electric.