Am i right thinking that with this addon i'll be able and move those following messages : "Spell is not ready yet" "You can't cast while silenced" (not exact words but you see what i mean) ?

The Hud looks like Underhood.

If it's a problem with NeedToKnow, it'll probably be a problem with TellMeWhen, too. They use the same underlying buff code.

Unfortunately, I don't think this problem is avoidable. I wanted NTK & TMW to be as flexible as possible, so instead having a giant (but still limited) list of hard-coded options, I made them so that you can track things by name. Which means that different buffs that have the same name (like all the Well Fed buffs) get lumped together. Sometimes that's good and sometimes that's bad.

Perhaps there's a way I could make it possible to track them separately by shift-clicking spells from the combat log. I've added it to my list of things to look into.

With my cartographer, ever since LK patch i haven't been able to see party member or BG members on my map except minimap. I looked it up and i've tried changing setting and i just cant seem to get them to come back. Does anyone have any idea why it is doing it how to fix it. And i have uninstalled and reinstalled with no luck.

For quite some time I've been annoyed by the following problem and I am wondering if anyone knows if a mod exists to solve it. It involves chat frames.

The problem is this. Whenever there is chat activity, I would like to have the chat window have a non-transparent (or slightly transparent) background color. But when all of the text has faded, I want the background color of the chat frames/window to be fully transparent. It's just so ugly looking at 2 black boxes whenever nobody isn't saying anything, and I really can't read the chat as easy when I have my chat background fully transparent permantently. I am using Prat for several chat functions, but I couldn't find this option in here. Any tips for this problem would be appreciated.

It's not exactly what you want but you might want to try MiniChat. It hasn't been updated for quite a while but maybe it still works.
It can minimize / fade out your chatframe after a set time of no activity.

Thanks, it's almost what I want. I have 2 chatframes and it only auto-minimizes if both of them are inactive for X time. Would be nice if it could minimize each chatframe seperately depending on activity in each frame though. At least this is a start!

I think what you want is pretty much impossible. The Curse page for Omen Threat Meter says this about AoE threat and targeting:

I used to use an Addon in TBC that used to just have a button on the vendor frames to be able to Sell all grey trash items and any set items you selected. Can anyone remember this addon?

AutoProfitX I think
Link - AutoProfitX addon - Curse

You can go to Interface Options/Display. There in the right Area is a drop down box labeled "Show threat warning" with the values "never, always, Instance, party" (by memory, real text could vary, but should give the direction)

This will make your Nameplates "glow" red, when you have aggro, yellow on losing/gaining aggro, no glow when you re not having aggro. Excellent for Trash/Multimob Tanking.

This is standard blizzard ui, most nameplate modifiers (like evl_nameplates) just keep/inherit this glow. Aloft should be able to do the same. Make sure you have enemy nameplates enabled and the mobs are in a range that show nameplates.

And for this:
I might be wrong, but according to the link you provided:
The nameplates are showing "no threat data" when you dont have aggro (incl. there is no threat data). This is of course the case, when you are not directly in combat with that unit.

When you have aggro - on the other side - you are directly in combat with that unit and the Blizzard API can display "You have aggro"