I'm sure someone talked about that, but it's difficult to find in the other threads.
Anyway, I'll write what I think.
Suggestion: possibility to add graphic icons on mob (in groups, raid). If I'm in a dungeon with 8 other guys, we'll should attack one monster at time, and in a real situation the thing could be simply; sometimes with the visual camera of DDO this can be difficult.
Suggestion: improve the DR by items and feat. DR of barbarian is nothing at high lvls, so there could be a system to adapt.
Suggestion: another thing I'd like, is to have a preferred gear slot (as weapon one, but only with armor and accessory to help changing outfit all-in-one-click) and to fix some inv slot for specified items. Yes, I want my bow will put in the same slot it were when I changed my blade with it. Or, another system, is to declare where things must be putted: I want all the items I find will be putted in my second inv space, the collectables in the third or the bag and so on. A good hand keeping the inv in order.
Idea: all objects should have an "alignment" and a power of that. So you wanna use a not cleansed GS? No, you cant use with that pure good item. You wanna use a chaos sword with a law helm? you cant. This should go along with player alignment when adding the evil, because right now they are useless, or better, they are all true neutral if you dont need for race or class. Maybe adding more or less xp for quests, special rew, and so on based on alignment should be a good thing.
Idea: I know this should be impossible to develop, but I try to explain. It is boring that many users have a similar build and equip, only because "the kopesh it's the best dps with X and X and so on", or "rogue, do not use light armor use this robe it's better". It'll be a nice thing develop a system to give bonus and malus to every weapon and armor, for ex: you use light armor? Well, good vs slashing but bad against bludg. Full plate? Good vs piercing, but less movement, more damage from spells, and so on.
Idea: Another difficult one. We all know HP is, like in the paper one, very important. But cant be the only important, along with fortification. Do you have not the high amount of hp? No, you cant join our group. Nice thing, for a new player that havent minos, sup. false life and though feat. No, hp are important, but like before, sure is a system that could be improved.
There is no doubt you are doing a very good work with DDO, it's very good developed. The suggestions and ideas here aren't a reclaim, but only a system to help DDO become even better. Surely they must be studied, because as they are cant be useful I think; guess your work is to keep the good one and trash the others.
Thanks for reading,
a new online player.