Is this really a problem with roles though? It sounds to me that you are simply not enjoying the Wizard class. If you want to play the Wizard like a Striker, why don't you play a class that is a Striker? The Warlock isn't that different from the Wizard in concept, particularly if you tweak the fluff to taste. You could also try the Sorcerer out when the PHB 2 is released. That is the reason multiple classes with the same power source exist.And frankly, I want to play a Wizard as a Striker, not a Controller, but the game doesn't seem to be letting me.. My most useful spell is Flaming Sphere. ... it makes me groan inwardly to keep using the damned repetative thing every "day", but it's the only blasted thing that fills in the tactics when we get into the big tussles. And I seem to wind up using my encounter powers in roughly the same order for the same ends every bloody enounter. ... I think if it weren't for the creativity I've been able to squeeze out of my cantrips, I'd go insane at the repetativeness. And unless there's a huge mess o' badguys, a Wizard can't but keep firing Magic Missiles into the melee everyone else is enjoying.
I guess I simply don't understand why it is a problem for a class to built around a single role.
From the sounds of it, though, your problem may be more to do with the power system of 4E than with class roles.
Personally though, I enjoy playing my Wizard. Though I would prefer it if Force Orb actually hit something for a change.