If it isn't a good idea then what should be done to fix that issue? The stamina bar was just an idea but I'm sure there's better ones.
I don't know the exact methods in play to calculate weapon speed, but IMO no human being on earth could move heavy weapons with the speed they do in Warband.
I think the devs were confused at where two hander speed comes from: their momentum. They realized these weapons could be fast but didn't take into account the wind-up time it takes to get there, and how devastating it can be to lose that momentum. So we have players that can unleash relentless attacks that can't skillfully be countered unless a considerable amount of luck is factored in. And if the weapon has crushthrough? You might as well either run, stay away, or prepare to die.
I can't really offer anything solid to please all sides of the field. But like I suggested earlier: make weapon weight the determining factor in a weapon's speed, give or take some small differences depending on the particular weapon. Two-hander damage and range more than makes up for a lower speed, and that momentum can be attained by (we hope skillfully) chaining attacks which are placed to HIT, not overwhelm.
Again this suggestion surrounds an issue that lies mostly with the core of Warband, but I think it's something that could be changed in the mod.