Believe it or not, in real historical combat systems, one uses similar guards and attacks with a staff, halberd, spear, and longsword. The guards and attacks also translate into shorter weapons. Now, some things do change for obvious reasons, but training with a longsword can and does improve ones ability to use a spear and a long axe a great deal. I think it'd be nice if this translated to the game, and it would be even nicer if they could do that *and* keep the weapons individual skills. So perhaps they could have an underlying hand to hand weapons skill that improves ones ability with all hand to hand weapons, with the traditional short/long/axe/spear/blunt skills as specializations.
I like this idea. Implementation of a system that says "For every 2 points of Longsword, you gain 1 point of Spear, Staff, and Axe" or some similar stats. This allows you to be proficient with similar weapons, despite lack of use, while still allowing you to pick one favorite weapon that you are just better at. If a Warrior who usually fights with a spear picks up a longsword, they wouldn't be instantly terrible at it because they know how combat with big weapons works. They just won't be quite as good as someone who specializes in longswords and has used them for much longer.