I didn't read the whole thread, cos its so long. Maybe this extremely long sword hasnt been introduced here yet? To my understanding this is the longest sword actually used in battle anywhere in the world.
In M&B this sword would be comparable to a spear, in a sense that it would have only pierce damage. It could be single handed weapon, with a bit more damage than spear, 'cos its made entirely out of steel, unlike most spears. Maybe I should make an addon out of this?
"In addition to an 18 foot lance, the Hussar carried a second sword called a pallasz strapped to his saddle. This sword had a sabre grip and a straight, edgeless blade between four and six feet long. The cross-section of the blade was square like a fireplace poker and was used to pierce armor once the Hussar had lost or broken his lance." http://www.rencentral.com/sept_vol1/hussars.shtml
"The koncerz originated from a medieval sword and appeared at the end of the 15th century when it was about 1.3m long, quite heavy and badly weighted. By the late 16th century it had increased in length to a typical 1.60m overall (1.40m blade) and was much better designed. The koncerz was a stabbing sword, used more like a spear and it provided a rider with a very long reach. It had no cutting edge, just a sharp pointed end, being triangular or square in cross section."
http://www.jasinski.co.uk/wojna/comp/comp06.htm
And yes, I know this is a post-medieval weapon, but aren't crossbows too?