It's legal, but a dumb idea. If you need to shoot someone, you'd shoot to stop the attack, not to warn them or 'try to hurt them'. Also, as you noted it's 'less lethal', not non-lethal, so the potential to kill is always there, even if 'you didn't mean to'. That's a worse situation to be in.
If you are forced into a situation where you need to shoot someone, it better be your last option and in self defence or in the defence of others under your protection. In that situation, I wouldn't want half-assed ammo to save my life.
Odd first question... you will be accused of being a troll in short order.
i would have to agree with this statement.
the other issue is that to point a gun or to shoot it, regardless of what is in in all falls under the same area under the eyes of the law.
the issue that you may get into if you should have to use the gun is that by owning less lethal ammunition, one could argue that you INTENDED to use it.
However, if you shoot someone with lethal ammo, you can then "change" your story.
Example:
Someone breaks in. You unlock your shotgun. Load it just in case and proceed to check out the situation (after calling the cops of course

)
However, if you have the less lethal ammo, you are faced with 1 of two choices.
1. You keep the gun loaded at all times with said ammo.
2. You load the gun with the ammo should you feel the need to.
Problems:
1. If it is proven that you kept it loaded at all times, or that you bought the ammo strictly for home defense, you get into the issues of intent and culpability; you intended to shoot someone.
2. if you only load the ammo when someone breaks in, then you fall into the issue that canucklehead touches on, which is why bother? If your worried or fearing for your life, dont trust the less lethal ammo.
Lastly, the intruder, then becomes a victim. With a life, a story and injuries. He can sue you for everything you're worth. I asked a cop about home defense once. He said this:
Shoot to kill. Who will the jury believe? The dead intruder, or the man protecting his family?
There are obvious stipulations to this, such as shooting someone in the back etc
Now in no way do i support killing someone, and i pray that i never have to use my firearms in any kind of defense applications, but if i ever have to, i want the problem to stop there. in no way do i want it to continue in court.