That's great
I can't seem to physically get a/o keep mine in the cart.
And he still seems to pick things off the shelves without me seeing that he has done so
I think that riding in the basket is still a novelty with mine. He'll try and stand up occasionally if we're not moving, but he's figured out that if I start moving he'd better sit his ass down with a quickness. Maybe have him ride ON the basket? Like standing in front of you, facing forward, hold the handlebars and put his feet on the bar below?
Something else I've seen other people doing (at Giant) is having their smaller kids pull those smaller wheeled baskets. The ones that look like large hand baskets but have the long handle (that's not quite long enough). Not sure it'll cut down on the grabbies, but it'll make them easier to spot!