One of the biggest problems in DDO (besides lag) is that some build styles/options are "traps", in the sense that they are quite useless at level cap, impractical, simply useless, etc.
It is really difficult to get high enough AC to be useful at high levels, so most, if not all, melee toons are simply going to try and get as much strength, constitution and HP as possible. This is simple and practical. It's the only way to build a melee toon, and that's kind of boring. My hope is that one day the devs will balance things so that AC is more useful.
So, my suggestion is that there be a couple of feats and changes to feats in order to make dexterity builds more useful.
-->Improved Weapon Finesse: While wielding a finesse weapon, and while your dexterity is higher than your strength, you gain X% attack speed bonus where X is equal to your dexterity modifier. X is equal to half of your dexterity modifier when dual-wielding.
-->Trip/Improved Trip: Make an attack that can also trip an opponent, knocking them to the ground. You use your strength or dexterity modifier to determine the DC, whichever is higher.
I would also like to see staves as a finesse weapon for the Acrobat PrE.