First of all, this will be a development post, so maybe incomprehensible for someone.
Roland F. pointed out, what is the problem:
Just one thing: drag up was not only go to inbox in the original version. go back to the inbox or the label/folder of the current mail would be better.
I know that and I would like that too. But it is impossible. My first idea was to emulate Gmail's hotkeys.
var event = document.createEvent("KeyboardEvents");
event.initKeyboardEvent('keypress', true, true, null, key, 100, '');
event.keyCode = key.charCodeAt(0);
event.charCode = key.charCodeAt(0);
Where key variable is j or k. Unfortunately chome has a bug: keyCode and charCode is read-only in webkit (probably gmail is using those). If I decided to make firefox version, it is functioning normally. I tried with TextEvent, jQuery keydown, keypress and keyup events too. Neither works.
If you have any free minutes, write a comment here for hurry up Chrome developers. Any ideas are welcome!
This is a dead-end road. I decided to switch to mouse click event and it roughly works! Drag up gesture is clicking on the 'Inbox' button, I wanted to target the 'Back to somewhere' button but it failed. I will try it again later.
I would like to make a built-in notification when fire at every new release, so when it's done the next release will be goes to market.