Holy cow, the basic understanding of the concepts of density and fluid mechanics in this thread is mind-numbingly low. You don't even need a high school education to get past some of this stuff...
Decreasing gravitational pull would change the downward body force on each differential element of water in the selected body. The weight of the water would be affected, true, but density is mass over volume. Unless gravity were completely eliminated over the control volume, the downward force will be sufficient to keep the water in the same volume, therefore keeping the same density.
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I actualy think that if the water is less dense, you would sink more.
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Correct. Put a straw in a glass of tap water. Now, put the same straw in a glass of salt water.
Buoyancy force = density of the displaced fluid * volume of the displaced fluid * gravity. Therefore, the net downward (sinking) force on a body submerged in a fluid is Fnet = mg - pVg. The higher p (density *of the displaced fluid*), the lighter the object will be. If pVg is greater than mg, the object will float. Therefore, if the density of the water in the world of Guild Wars was lowered, the same thing would happen that currently happens: you would drop immediately, staying on the ground as you entered the water. This is, however, completely irrelevant, since the density would not be changed by a deviation in gravitational pull on the control volume.
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Now, on to the suggestion:
-It is poor. Firstly, we already know it is in the works for GW2, and you should know that it would be incredibly impractical to implement into GW1... the inherent difficulty of adding a whole dimension of maneuverability should be common knowledge. Ever read the book Flatland? Try it.
-In a game 4 years old that has never had a Z-axis, everyone who has played it for more than 20 seconds has adjusted to the fact that it lacks third dimensional movement (in an avatar-relative sense). Changing this would make a few WoW players happy and piss off the rest of Guild Wars.
Summary: /notsigned
And I hope you learned something.