The boards ate the post I tried to make yesterday, so let's do this again - hopefully it'll take this time.
As for reach, you're thinking of 3.0 and Arcana Evolved. Perhaps Paizo, too (I know nothing of that). These systems have reach weapons adding +5 ft to your reach and leaving the first 5 ft around you the area you cannot attack (unless it's a spiked chain or similar reach weapon).
I'm not sure how Paizo does it - I don't think I've seen it come up yet. They do have a really good system for handling disarm, trip, etc., though - they condensed all the opposed rolls into one roll called a CMB (combat maneuver bonus), which is your BAB + Str + size mod* vs. DC = 15 + opponent's CMB. Obviously this needs a bit of work - the base DC is too high (drop it to 10) and the size mods too low (double them) - but it's a pretty good system, and it makes grappling SO much easier.
*Size mod is much lower - +1 for Large, then +2, +4, etc.
I didn't realize that 3.5 flat out doubled the reach, but I came up with an idea - a reach weapon increases the creature's reach by 150%, instead of 200% (round up). So, a Medium creature still has a reach of 10 ft., a Large is 15, a Huge 25, Gargantuan 30, and Colossal 45. This is much more than simply extending it by 5 ft. (imagine a storm giant waving around a toothpick) but much less than double the reach. (What they actually did wasn't "double the reach", but increased the reach by 5 ft. per size over Medium - it just happens to double.)
I was going to combine this with another rule - you can make attacks within the range of your natural reach with the butt of a reach weapon (polearm or longspear), but it deals damage as a staff and you suffer a -4 penalty.
I think Phindar means making it a light, two-handed weapon would mean both a +4 (for two-handed) and -4 (for being light) on the Disarm and Sunder attempts.
Light weapons and 2-handed weapons are totally different things. You can wield a Light weapon with two hands, but you won't get anything out of it. You cannot, however, make a weapon Light AND 2-handed.