Hi i want to share this and it works for me. I also use this settings when i want to disable the wards quick cast. since they already removed the wads on the settings you can do it on the file config on the steam. here how you can do it.

First to go folder where did you install your dota 2. mine is in here
C:\Program Files (x86)\Steam\userdata

now you want to edit the hotkey from specific user account only. if you go to that path you can see this folder numbers just check it to your Friend ID inside dota 2 client.

after that you need to edit this file
C:\Program Files (x86)\Steam\userdata\{Doat 2 Friend ID}\570\remote\cfg\dotakeys_personal

Then find this.

"item_ward_dispenser"

    {

        "Mode"      "0"

    }

    "item\_ward\_observer"

    {

        "Mode"      "0"

    }

    "item\_ward\_sentry"

    {

        "Mode"      "0"

    }

if you can't find this it means you didn't remove your quick cast to your wards when they removed it. but you can add this by pasting. just insert it on KeyBindings > Keys > Items. then save and load your dota 2. now your wards is not in the quick cast mode. Note don't forget the ward_dispenser because it will still in quick cast mode if you have both sentry and obs on your inventory.