I'll start off by saying I basically agree that being disgruntled about staff support is kind of a goofy thing to be disgruntled about, IMO.
But I think you've hit closer to Mengu's underlying problem, because why wouldn't these be enough? What are they missing? Why didn't he see them as solutions? Assuming he's a well-educated D&D player, why didn't these ideas propose themselves?
Possibly, it is because there's nothing special about doing those things with a staff, compared to just doing those things with your two-handed bastard sword/greataxe/sword-and-board/whatever. There's no incentive. There's no payoff. I do it with my staff, and I'm just like the guy who does it without a staff, give or take a feat or two. There's nothing different, unique, or special about it. I don't feel like a staff fighter, I feel like any other fighter, except I spent my feats to use an unorthodox weapon.
I think you run into this problem more frequently when you're basing powers on effect rather than on method, so it requires a bit more attention, a bit more work to go back and make sure that you get a little special kicker for doing what you'd clearly want to do as a staff fighter, something that leads the player by the nose and says, explicitly, this will be cool to do. To make incentives to play to archetype.
I think Mengu perhaps doesn't see what's so cool about it, just given the mechanics.