It isn't a bad idea. Sure, he isn't a ninja, but he can still tail thugs from the rooftops pretty easily.

"Sure." There's the twinge of guilt at letting Donnie work on more upgrades to his crutch, but after their last conversation he's doing his best to ignore it. Though he pauses, looking down at what's remaining of his coffee. "... I tried that battery charger you rugged together. It works pretty well as a back-up." Something else he's getting, free of charge.

He sighs. "If you ever need some particle accelerator work done, just ask."

Because now that Donnie has some real equipment, he's clearly only a few steps away from wanting to smash atoms into each other.