Game Mechanics: Character Gravity

[chrismed]

I noticed something that seems to be off. It has also given me problems as well. This coming from someone who has played EQ and EQ2 for almost 10+yrs now.
I noticed the weight of characters are slightly heavy. This causes a problem in several ways. One is the fact that in the original when running from a MOB that might end up killing you, you had a fighting chance by jumping which would keep you a little ahead untill your stamina was all gone and might give you a better chance of getting away.
The other problem I noticed because of this is you can't stay stationary in water in order to cast because your sinking. I tried several times to cast while under water and because I was sinking everytime I started casting I would get interupted. So that would mean the only way to cast is to be all the way at the bottom.
Not even in EQ2 do you sink unless you have a mystic spell on you that allows you to sink to the bottom.
Just somethign I noticed that was buggin me because it feels wrong.
Possibly a fix?
Thanks