Tucker doesn't beg from me or mom, we don't feed him while we eat. I don't care if he watches though, even if he's close. But he rarely does this, he knows nothing will come of it. He begs super bad from my dad though. Only when we eat in the living room, because those are the sort of meals he feeds him from. We eat pizza in the living room and dad gives him his crust. Dad eats ice cream in the living room and lets Tucker lick his bowl when he's done. So Tucker sits and stares at dad while he eats and then when dad is getting to the end of his slice/bowl Tucker starts whining, sneezing, slapping his paws on the ground, letting out the occasional bark. I have absolutely no desire to stop it, it's dad's fault. If he wants to stop it he can. Tucker shouldn't be eating pizza and ice cream anyway.
But if I did have a dog who begged from me even though I didn't feed him from my plate I would be okay with staring, air sniffing, even putting a paw on me. But no noise, no poking, no scratching. Basically no behaviors I dislike in general.