One thing I'd love to see (which would both address the issue of fighting with a long cape, and would also look super-cool):
-- Batman is in the middle of several guys, fighting, when a guy grabs a fistful of his cape with both hands...
...Whereupon Batman spins, pulling the cape into a tightened thick "rope," and yanks HARD on the cape with one arm, sending the guy reeling towards him and SMACK -- into a straight right cross in the face (or a fast forearm gauntlet uppercut.) BOOM -- guy goes down hard.
Or (and this might be too "sci-fi," but it's an interesting idea) -- if Batman can send an electrical charge through his gloves to turn the cape into a glider, then why not give him the ability to electrify his entire suit and cape, even for a moment? That way, if several guys tried to grab him and overpower him, his entire suit could act like a taser and zap the hell outta them.
I wouldn't overuse this device, but it could actually make him scarier -- "The Bat-man" strikes without warning, and if you actually try to grab him, he'll sting your @$$ like an electric eel -- THEN knock you out.
(Note that the comics -- including "Hush" -- have shown that Batman's suit has several "defensive" modes to prevent him from being captured -- including knock-out gas emitting from his cowl if he's about to be unmasked. Yeah, I know this might work against the realistic mood that Nolan's trying to set up, but it would work, I think, if you show Bruce suiting up and making it clear that he has a LOT of tricks up his sleeve before he goes out to thump heads in Gotham. But, you also make it clear that he uses his gadgets only to get out of a jam that he can't fix immediately with his wits and fists.)
-- Admiral Nelson