Agree... but it would be good to send items that are tradeable way more easier. Example, when i send items to craft , and i need send mats to my cheff and card master. placing them on a server warehouse can reduce my time spent sending 3 per 3 items/packs xD

Well it's certainly possible but it would mean adding more warehouse slots which is not possible at the moment. I found out the hard way when I increased the amount of inventory and warehouse slots a couple of updates back that Iris is a bit fragile if you add too many and I ended up having to reduce them again a few days after.

Why would you want this anyway? Just for easier item sharing between characters or you were perhaps thinking about non-tradable items being shared with your other characters as well?

those non-tradable items..love to share them with my other toon but cant trade it

Not really going to happen. If I were to add an account warehouse I would add another limit to items that would allow some items to be placed in there but most untradable items would remain untradable.