I do play this game as all other games of Plarium.
But your suggestion seems like "Give us everything for nothing". You have a great Hero feature which allows you to make your Units stronger. Of course there will be some fair limits.
You can't get all Moon Coins in a single click. If you want them, you need to wait. If you need some space, discard the Chests before opening them. I understand that you open them hoping to get a more valuable Item than you have now, but if so, then you will need to wait to sell it if it's not worth of equipping it.
I did pass the suggestion to make a selling queue, to allow selling more than one Item, but there's still no guarantee that they will be accepted by our developers.
But the wait time won't be removed anyway. It's the basic feature, and it's your choice. You already have 18 free slots. If you need more, you can buy them with Sapphires. And it's also fair. If you don't want to spend your Sapphires, you will still have 18 slots. That's quite many, don't you think? The rest is up to you - you can build your strategy around available slots, or you can buy some more.