So,MeMailSettings v0.0.5 is finally done. Now you can map your standard folders (like Inbox, Sent Items, Trash etc.). To do so, you should follow the steps:
1) Open application.
2) Tap on "Edit Folders" button.
3) Tap on account that you want to edit.
4) Tap on Standard folder (the "blue" names are standard folders, the white names are binded to the those folders server's folder (or a local storage)).
5) Tap in the selection dialog on any folder that you want.
6) profit :-D

P.S. Folder's list is not updated instantly yet, probably I will do it in the next release